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Here is the text at the link you posted. It is public domain, so there is no issue with posting it:

If thou wilt give me leave, I desire to go up to Jerusalem, and see the faithful saints who are there, especially Mary the mother, whom they report to be an object of admiration and of affection to all. For who would not rejoice to behold and to address her who bore the true God from her own womb, provided he is a friend of our faith and religion? And in like manner [I desire to see] the venerable James, who is surnamed Just, whom they relate to be very like Christ Jesus in appearance, in life, and in method of conduct, as if he were a twin-brother of the same womb. They say that, if I see him, I see also Jesus Himself, as to all the features and aspect of His body. Moreover, [I desire to see] the other saints, both male and female. Alas! why do I delay? Why am I kept back? Kind teacher, bid me hasten [to fulfil my wish], and fare thou well. Amen.

Bolding added by me.

To say somebody is "as if" is distinctly different than saying somebody "is."

Here is the text at the link you posted. It is public domain, so there is no issue with posting it:

If thou wilt give me leave, I desire to go up to Jerusalem, and see the faithful saints who are there, especially Mary the mother, whom they report to be an object of admiration and of affection to all. For who would not rejoice to behold and to address her who bore the true God from her own womb, provided he is a friend of our faith and religion? And in like manner [I desire to see] the venerable James, who is surnamed Just, whom they relate to be very like Christ Jesus in appearance, in life, and in method of conduct, as if he were a twin-brother of the same womb. They say that, if I see him, I see also Jesus Himself, as to all the features and aspect of His body. Moreover, [I desire to see] the other saints, both male and female. Alas! why do I delay? Why am I kept back? Kind teacher, bid me hasten [to fulfil my wish], and fare thou well. Amen.

Bolding added by me.

To say somebody is "as if" is distinctly different than saying somebody "is."

It becomes more complicated however when "brother" is qualified as follows:

For also James, the brother, according to the flesh, of Christ our God, to whom the throne of the church of Jerusalem first was entrusted, and Basil, the Archbishop of the Church of Caesarea, whose glory has spread through all the world, when they delivered to us directions for the mystical sacrifice in writing, declared that the holy chalice is consecrated in the Divine Liturgy with water and wine. And the holy Fathers who assembled at Carthage provided in these express terms: "That in the holy Mysteries nothing besides the body and blood of the Lord be offered, as the Lord himself laid down, that is bread and wine mixed with water." Therefore if any bishop or presbyter shall not perform the holy action according to what has been handed down by the Apostles, and shall not offer the sacrifice with wine mixed with water, let him be deposed, as imperfectly shewing forth the mystery and innovating on the things which have been handed down.

The Quinsext Council, (or the Council in Trullo), 692