0. I guess you didn't read my post...
1. What I understand is: The human nature (including the human soul and human
body) assumed by the Son of God is made/created instantaneously when
conception by Mary.
2. I cannot find "A defence of the Nicene Creed" anywhere on the internet.
Could you please show me explicitly the source of this "Defence"?
3. I think "Athanasian Creed" gives more complete information than the
"Defence" you provided without explicit source:
https://en.wikipedia.org/wiki/Athanasian_Creed

我完全知道你的意思。你不知道我的意思。若是，亚他那修都承认基督具有被造人性，那么你的问题已经从根本被解决了。