I just read it and I laughed.
“maintaining that from the moment when she was conceived in the womb, the Blessed Virgin Mary was kept free of original sin”
There is ZERO evidence of that in the Bible and in fact quite the opposite.
Laugh all you want, just don’t be ignorant.
So? Everything that is true is not in the Bible. The Holy Spirit did not go out of business when the Bible was canonized by the Catholic Church. If God wanted his Son to be born of a sinning woman, there were plenty to pick from.