By recognising that the pronoun "us" or "you" (depending upon the translation) refers to the people being addressed - i.e. the Church.
It makes little sense to restrict the pronoun 'you-ward' in II Pet 3:9 to the church alone:
"The Lord is not slow about His promise, as some count slowness, but is patient toward you, not wishing for any to perish but for all to come to repentance."
Why would He be patient towards those who have already repented and are guaranteed eternal life because He doesn't wish any to perish? Why would Christians have any need to repent again of sin and turn to Christ?
Paul could perhaps be specifically referencing Gentile believers - that God's longsuffering has allowed the Gentiles to be brought into the fold (Such as referred to in Rom 11:11-12) - but even if that was what was mind, it would not negate the parallel scriptures showing that God desires all men to repent and be saved:
"First of all, then, I urge that petitions, prayers, intercessions, and thanksgiving be offered
on behalf of all men, or kings and all those in authority, so that we may lead tranquil and quiet lives in all godliness and dignity. This is good and pleasing
in the sight of God our Savior, who desires all men to be saved and come to the knowledge of truth. For there is one God and one mediator between God and men,
the man Christ Jesus who gave himself as a ransom for all people.."
I Tim 2:1-6
Here we see clearly that we are to offer prayer on behalf of all men, including heathen kings in authority (many of whom never come to faith), because God desires all men to be saved. Furthermore, God gave Christ as the mediator between God and man, for Christ gave Himself as a ransom for all people.
"Do I take any pleasure in the death of the wicked? declares the Sovereign LORD.
Rather, am I not pleased when they turn from their ways and live?" Ezek 18:23
"Therefore, you Israelites, I will judge each of you according to your own ways, declares the Sovereign Lord.
Repent! Turn away from all your offenses; then sin will not be your downfall. Rid yourselves of all the offenses you have committed, and get a new heart and a new spirit. Why will you die, people of Israel?
For I take no pleasure in the death of anyone, declares the Sovereign Lord. Repent and live!" Ezek 18:30-32
God isn't saying here, 'I only desire that some of you Israelites repent after I give you a new heart and spirit.' He desires them all to live, so commands they all repent and get a new heart and spirit (which we know can only be done by faith, not works.)
"So from now on we regard no one from a worldly point of view. Though we once regarded Christ in this way, we do so no longer. Therefore, if anyone is in Christ, the new creation has come: The old has gone, the new is here!
All this is from God, who reconciled us to himself through Christ and gave us the ministry of reconciliation: that God was reconciling the world to himself in Christ, not counting people’s sins against them. And he has committed to us the message of reconciliation. We are therefore Christ’s ambassadors, as though God were making his appeal through us. We implore you on Christ’s behalf: Be reconciled to God. God made him who had no sin to be sin for us, so that in him we might become the righteousness of God." II Cor 5:16-21
Here Paul is building off the concept of Christ as mediator between God and man and telling Christians, who have been reconciled to Christ, to be ambassadors for Christ and spread that ministry of reconciliation. He ends with what the exact appeal is: imploring non-believers to be reconciled to God, for God made sinless Jesus to bear their transgressions so they might be the righteousness of God.
He doesn't tell them that God only wants a select few to be reconciled, or to spread a message that a select few should await reconciliation (or already have been reconciled), etc.
So TULIP is hyper calvinist. What would your version of low Calvinism look like? Arminianism?
I will guess he is referring to 4-point Calvinism/Amyraldism, which rejects the L (limited atonement) of TULIP.
This is an example of how systemized theories of man can't just assert themselves as true or point to a few verses that they claim in support, but need to support their claims from the whole of scripture. There are many variants on Calvinism, variants on Arminianism, other systemized theories like Molinism, etc. - and to add to that the many Christians who do not hold to any such systemized theory or are undecided.
To add to this confusion even more, often terms are used in very different ways (born again, predestination, depravity, sufficient grace, etc.) - so these terms need to go back to scripture to be defined and care needs to be taken when any definition deviates or gets ran through man's philosophy.