That is different from what I have heard Pope Shenouda III once, that God condemned by death Adam and Eve and all their offspring (he used the terms man sperms and woman eggs) which approves that the Original Sin in the context of the Coptic Church theology, is biologically inherited. Otherwise, we can say, again, that there is some departure from the ancient teaching of the Coptic Church in these days.

Anyway, regarding St. Athanasius and his statements quoted by you previously, as I said we must understand them in the theology context of St. Athanasius as a whole, and not making out-of-context quotations, which may lead to misunderstanding. Listen what St Athanasius says in the same book: On the Incarnation of the Word:

For God has not only made us out of nothing; but He gave us freely, by the Grace of the Word, a life in correspondence with God. But men, having rejected things eternal, and, by counsel of the devil, turned to the things of corruption, became the cause of their own corruption in death, being, as I said before, by nature corruptible, but destined, by the grace following from partaking of the Word, to have escaped their natural state, had they remained good. 2. For because of the Word dwelling with them, even their natural corruption did not come near them, as Wisdom also says : “God made man for incorruption, and as an image of His own eternity; but by envy of the devil death came into the world.” But when this was come to pass, men began to die, while corruption thence-forward prevailed against them, gaining even more than its natural power over the whole race, inasmuch as it had, owing to the transgression of the commandment, the threat of the Deity as a further advantage against them.
So, God by His knowledge in advance, warned Adam from eating from the forbidden tree, because when he eats from it, he will sin, and this sin separates him from God, the Life-Giving, which leads naturally to death and corruption.

Shall we continue?

In IC XC