Did you read the story you linked? It is all about Greenberg and says Gaetz wasn't named in any of the court documents. I don't think it really adds credibility. Greenberg is a crook, plain and simple.
On one hand, you could say Greenberg agreeing to cooperate could implicate Gaetz. On the other hand, you could argue that Greenberg is trying to throw Gaetz under the bus to get a lighter sentence.
What I find interesting is if Gaetz had sex with an underage girl in 2017, that girl is at least 20 now. The way things are nowadays, she would have already held a news conference with Gloria Allred laying out exactly what happened with Gaetz. That hasn't happened, that's why I still say the allegations are "vague".