I actually agree with him. If you look at Paul's commission it states, "go to the kings and gentiles and the children of Israel." Notice the two bold "and"(s) there? The first is kai, the word for "and." The second is "te," which is the word for both or even also. And gentiles (ethnos) is also nations. So... a retranslation... "go to the kings and nations both the children of Israel." If you place your cursor here over Genesis 35:11 you'll see Jacob's seed prophesied as, "nations and kings" which are the "children of Israel" (Jacob).
Couple that with messiah saying, "I have not been sent BUT to the lost sheep of the House of Israel" and him also sending his disciples to the lost sheep of the House of Israel... then that is where the weight of his mission was. (I believe)
Meet Paul the gentile Apostle
Paul’s writes 13 books to the Gentiles from Romans to Philemon. This is the part of the Bible that a new believer should read first.
Paul chosen by the Risen Lord:
Acts 25:17 Jesus said; Delivering thee from the people, and from the Gentiles, unto whom now I send thee,
18 To open their eyes, and to turn them from darkness to light, and from the power of Satan unto God, that they may receive forgiveness of sins, and inheritance among them which are sanctified by faith that is in me.
Rom 15:16 That I should be the minister of Jesus Christ to the Gentiles, ministering the gospel of God, that the offering up of the Gentiles might be acceptable, being sanctified by the Holy Ghost.
Gal 2:7 contrariwise, when they saw that the gospel of the uncircumcision was committed unto me, as the gospel of the circumcision was unto Peter;
Rom 16:25 Now to him that is of power to stablish you according to """my gospel""" and the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world began,
2 Tim 2:8 Remember that Jesus Christ of the seed of David was raised from the dead according to """my gospel"""
Gal 2:2 And I went up by revelation, and communicated unto them that gospel which I preach among the Gentiles, but privately to them which were of reputation, lest by any means I should run, or had run, in vain.
Romans 2:16 In the day when God shall judge the secrets of men by Jesus Christ according to my gospel.
Paul the gentile Apostle, Example, Prisoner, Minister, Leader & Our Pattern
Romans 11: For I speak to you Gentiles, inasmuch as I am the """apostle""" of the Gentiles,
2 Thes 3:9 Not because we have not power, but to make ourselves an """ensample""" unto you to follow us.
Eph 3:1 For this cause I Paul, the """prisoner""" of Jesus Christ for you Gentiles,
Rom 15:16 That I should be the """minister""" of Jesus Christ to the Gentiles, ministering the gospel of God, that the offering up of the Gentiles might be acceptable, being sanctified by the Holy Ghost.
1 Cor 11:1 Be ye """followers of me""" even as I also am of Christ.
1 Tim 1:16 Howbeit for this cause I obtained mercy, that in me first Jesus Christ might shew forth all longsuffering, for a """pattern""" to them which should hereafter believe on him to life everlasting.
Col 1:
18 And he is the head of the body, the church: who is the beginning, the firstborn from the dead; that in all things he might have the preeminence.
24 Who now rejoice in my sufferings for you, and fill up that which is behind of the afflictions of Christ in my flesh for his body's sake, which is the church:
25 Whereof I am made a minister, according to the dispensation of God which is given to me for you, to fulfil the word of God;
26 Even the mystery which hath been hid from ages and from generations, but now is made manifest to his saints:
27 To whom God would make known what is the riches of the glory of this mystery among the Gentiles; which is Christ in you, the hope of glory:
Rom 1:1 Paul, a servant of Jesus Christ, called to be an apostle, separated unto the gospel of God,
Rom 11:13 For I speak to you Gentiles, inasmuch as I am the apostle of the Gentiles,
1 Cor 1:1 Paul, called to be an apostle of Jesus Christ through the will of God
2 Cor 1:1 Paul, an apostle of Jesus Christ by the will of God
Gal 1

aul, an apostle, (not of men, neither by man, but by Jesus Christ, and God the Father, who raised him from the dead
Eph 1:1 Paul, an apostle of Jesus Christ by the will of God
Col 1:1 Paul, an apostle of Jesus Christ by the will of God
1 Tim 1:1 Paul, an apostle of Jesus Christ by the commandment of God our Saviour, and Lord Jesus Christ, which is our hope
2 Tim 1

aul, an apostle of Jesus Christ by the will of God, according to the promise of life which is in Christ Jesus
Titus 1:1 Paul, a servant of God, and an apostle of Jesus Christ
Eph 3:
1 For this cause I Paul, the prisoner of Jesus Christ for you Gentiles,
2 If ye have heard of the dispensation of the grace of God which is given me to you-ward:
3 How that by revelation he made known unto me the mystery; (as I wrote afore in few words,
4 Whereby, when ye read, ye may understand my knowledge in the mystery of Christ)
5 Which in other ages was not made known unto the sons of men, as it is now revealed unto his holy apostles and prophets by the Spirit;
6 That the Gentiles should be fellowheirs, and of the same body, and partakers of his promise in Christ by the gospel:
7 Whereof I was made a minister, according to the gift of the grace of God given unto me by the effectual working of his power.
8 Unto me, who am less than the least of all saints, is this grace given, that I should preach among the Gentiles the unsearchable riches of Christ;
9 And to make all men see what is the fellowship of the mystery, which from the beginning of the world hath been hid in God, who created all things by Jesus Christ:
Gal 2:
14 For when the Gentiles, which have not the law, do by nature the things contained in the law, these, having not the law, are a law unto themselves:
15 Which shew the work of the law written in their hearts, their conscience also bearing witness, and their thoughts the mean while accusing or else excusing one another
Gal 3:
23 But before faith came, we were kept under the law, shut up unto the faith which should afterwards be revealed.
24 Wherefore the law was our schoolmaster to bring us unto Christ, that we might be justified by faith.
25 But after that faith is come, we are no longer under a schoolmaster.
26 For ye are all the children of God by faith in Christ Jesus.
All of Paul's writings are to the church/body of Christ. Salvation comes by grace thru faith & faith alone. If there seems to be a contradiction in Scripture, see if the verse is under Grace or Law as the two won't mix.