I don’t think it’s a particularly unusual thing that Jefferson fathered children with a woman he owned. The manic denial that it happened is probably just a manifestation of the more general denial that it was a common practice among slaveowners.
https://freerepublic.com/focus/chat/3566404/posts
Would he? Possibly even probable. Did he? DNA says a man of his family did. So him or his brothers. Either is kind of skeevy. But saying that it was him for sure? Eh. Not enough evidence to be able to say for sure.
I know he freed other members of the family, like James who was Sally's brother and undoubtedly not his kid so saying that he freed them because they were his children also is something that is still a maybe.