In general whatever your opinions on the Soon Yi thing, it's all on public record. Using it as proof he molested a 7 year old is conflating two very different accusations. There's plenty of evidence to suggest that Woody liked them young, Manhattan is basically his thesis on the subject.
But there's not a single other allegation that he molesting pre-pubescent children, and in the one allegation there is, the claim is that he did it on literally one single occasion only. Which doesn't mean he didn't do it, but to my knowledge it's highly unusual for people with predatory paedophilic inclinations to act on them a single time only.
What's more that Moses Farrow blog Sam posted flatly contradicts Dylan's account, which was heavily based around a train set in the attic. He claiming there wasn't even a train set in the attic, or space for there to be one. I don't know what the truth is there but to my knowledge no one's ever countered that one.
Basically I think he's probably innocent, of the Dylan thing anyway.