I find it quite disconcerting when people write comments like this. If you're not willing to share what was said, so that we can judge whether or not it supports your veiled allegations, then don't make the allegations. It is in bad taste, and reflects badly on you.

I know it can be hard to resist talking if you believe you have inside information, but giving "warnings" like this without sharing details that are directly relevant to the claims he made in effect boils down to nothing more than an ad hominem supported by appeals to authority about the reasons for his claims.