Q. Has anyone been exempted from the original sin?
A. Only Jesus Christ, because He was incarnate of the Holy Spirit, which,
being God, is without sin, and of the Virgin Mary after her cleansing of
original sin by the Holy Spirit when the Angel announced to her the
conception and birth of Christ
So why are you quoting from an eastern catechism (one that also confirms byzantine catholic dogma which contradicts their latin counterparts) which proves the Immaculate Conception to be a heresy? Obviously, the heretical IC papal dogma claims she was spared of all stains of original sin at the very moment of conception. The above statement places any purification at the Annunciation and only AFTER her acceptance of Gabriel's message.
Now lets take a look what the council of Chalcedon actually said:
Extracts from the Acts.
Session II. (Continued).
And when these letters [i.e. Cyril’s letter to Nestorius Καταφλυαροῦσι and his letter to John of Antioch Εὐφραινέσθωσαν] had been read, the most reverend bishops cried out: We all so believe: Pope Leo thus believes: anathema to him who divides and to him who confounds: this is the faith of Archbishop Leo: Leo thus believes: Leo and Anatolius so believe: we all thus believe. As Cyril so believe we, all of us: eternal be the memory of Cyril: as the epistles of Cyril teach such is our mind, such has been our faith: such is our faith: this is the mind of Archbishop Leo, so he believes, so he has written.
Well so much for all your propaganda justinangel. This is 2016 we all have the original primary texts at our fingertips, no more forgeries, no more taking things out of context. St Cyril's epistles were the benchmark of Orthodoxy and correct belief. After the reading of Cyril's epistle's Pope Leo was allowed to read his tome because everyone agreed on the basics of Cyril's epistles. If Pope Leo did not agree with the contents of Cyril's epistle he would have not been allowed to proceed and would have been condemned. Now lets take a look what occured AFTER Pope Leo read his tome:
Extracts from the Acts.
Session II. (continued).
(Labbe and Cossart, Concilia, Tom. IV., col. 368.)
After the reading of the foregoing epistle, the most reverend bishops cried out: This is the faith of the fathers, this is the faith of the Apostles. So we all believe, thus the orthodox believe. Anathema to him who does not thus believe. Peter has spoken thus through Leo. So taught the Apostles. Piously and truly did Leo teach, so taught Cyril. Everlasting be the memory of Cyril. Leo and Cyril taught the same thing, anathema to him who does not so believe. This is the true faith. Those of us who are orthodox thus believe. This is the faith of the fathers. Why were not these things read at Ephesus [i.e. at the heretical synod held there]? These are the things Dioscorus hid away.
[Some explanations were asked by the Illyrian bishops and the answers were found satisfactory, but yet a delay of a few days was asked for, and some bishops petitioned for a general pardon of all who had been kept out. This proposition made great confusion, in the midst of which the session was dissolved by the judges.
Well there you have it. Once again the basis of the Tome's acceptance was that it agreed with what was already agreed upon by all, that is the Orthodox teachings of Cyril. Note how the Illyrian bishops had reservations of certain parts of Leo's Tome. The delay was caused because these Illyrian bishops who cried out "Let the Nestorians go to Rome" wanted more time to decipher the latin expressions and see whether Leo was teaching nestorianism.
Finally in session 4, the bishops made clear that Pope Leo's tome will hold the third place after the Nicene definition and after Cyril's doctrine at Ephesus. In fact it was not recieved till after all the bishops in attendance re-analyzed and voted whether Leo's doctrine conforms to the dogmas of the previous councils:
Extracts from the Acts.
Session IV.
...Paschasinus and Lucentius, the most reverend bishops, and Boniface the most reverend presbyter, legates of the Apostolic See through that most reverend man, bishop Paschasinus said: As the holy and blessed and Ecumenical Synod holds fast and follows the rule of faith (fidei regulam in the Latin Acts) which was set forth by the fathers at Nice, it also confirms the faith set forth by the Synod of 150 fathers gathered at Constantinople at the bidding of the great Theodosius of blessed memory. Moreover the exposition of their faith, of the illustrious Cyril of blessed memory set forth at the Council of Ephesus (in which Nestorius was condemned) is received. And in the third place the writings of that blessed man, Leo, Archbishop of all the churches, who condemned the heresy of Nestorius and Eutyches, shew what the true faith is. Likewise the holy Synod holds this faith, this it follows...
...The most glorious judges and the great senate said: Since we see that the Holy Gospels have been placed alongside of your holiness, let each one of the bishops here assembled declare whether the epistle of most blessed archbishop Leo is in accordance with the exposition of the 318 fathers assembled at Nice and with the decrees of the 150 fathers afterwards assembled in the royal city.