No, I said that it was being reported that he had recanted... and that was reported by The Washington Post. That would certainly call his credibility into question. However, his credibility is only important while we have to take his word for whatever he is claiming. If he has actual proof of fraud, then that would override concerns over his credibility. Once again, it sounds like his allegations concern something he overheard other people talking about doing... rather than what he observed them doing. But if he does have proof that these people actually followed through on what they were saying and committed fraud, then he should reveal his proof.
It's the kind of allegation which people make when they want to accuse someone else of misconduct, but have no proof, and want to make it as tough as possible to be accused of lying about it later:
Accuser: "I heard Bob and Mike talking about selling crack cocaine."
Investigator: "Did you see Bob and Mike sell crack cocaine?"
Accuser: "No. I just heard them say they were going to sell crack cocaine."
Investigator: "Do you have any proof that Bob and Mike ever discussed selling crack cocaine?"
Accuser: "No, but they did talk about doing it."
This is how you shift the burden of proof from the accuser to the accused. The accuser can't prove that Bob and Mike sold crack cocaine... but Bob and Mike can't prove that they didn't at least talk about it.