Sounds like they have multiple allegations from multiple victims across multiple years. That seems like a reasonable cause for USCF to investigate those allegations.
This comment [0] doesn't list their sources, but their list of events certainly makes it seem more conclusive than I was initially impressed skimming the post. That seems to be causing some confusion between the "just an accusation" and "it's not just an accusation" people.
[0] https://news.ycombinator.com/item?id=37080296