What he says is nonsense. It's certainly not in the Bible or an attempt to interpret the Bible.
At the very least, Jesus was born of a virgin as a way to show that he was different from every other person who ever lived. Also because the Bible predicted it 800 years before it happened.
(Isaiah 7:14 NIV) Therefore the Lord himself will give you a sign: The virgin will be with child and will give birth to a son, and will call him Immanuel.
RE: Theology. Why Jesus had to be born by a Virgin, according to Maximus the Confessor, part 1