I would respectfully disagree and that James does disprove the perpetual virgin idea, however this the issue of Mary’s virginity (which doesn’t make sense either as Joseph WAS her known husband, who in the world would go without sex in marriage?).
It is a side issue and not foundational to Christian belief if Mary was a virgin or not AFTER the birth of Christ, we know that she was before, as the conception of Christ was a miracle that only God could do, but once again Mary’s part in this is secondary, and she merely points to the Savior, Messiah, and OUR God!
-JS
Wad Mary’s marriage a sham before Our Lord was born?