that text doesn't appear on that page. and that's a very generalised statement covering a long period of time and wide area.
My understanding was that adults were rarely castrated, rather boys from certain regions were targeted (I believe boys from modern Sudan were preferred by the Ottomans)
Yes, certainly, they raided European coastal villages. But AFAIK the majority of captives would have come from captured merchant ships, which were exclusively men. The pirates weren't so into keeping accurate records.