I only said that because I know that claims like slander are complex, and I'm not sure exactly what one has to prove.
As for prosecuting Wilson if he confirmed the story, I don't think he could afford to be cavalier about the possibility, considering that he'd be the one taking the risk (and for no benefit). It might be feasible to prosecute him if he confirmed it and if it could then be shown that associates of hers had been compromised and had suffered severe consequences.