I’ve never heard of him. So, I would follow “rov”. “Rov” says he is a fraud.
Hmm, am I right? How should we apply rov here?
Seems that if he came to you, we could say he was piresh from the rov, so that we would say he is a fraud.
But, if you go to him, then he is kavua, so we should say it is 50-50. Like the case in kesubos with the woman who was impregnated by the passul l’kehuna.
So you should make sure to go to where he lives, not that he should come to you. Then it is only 50-50.
I guess 50-50 is not so bad. If you go to two, then statistically you will have gotten at least one real one. That actually sounds really good.
I suppose unless the rov creates a chazaka, kind of like a ruba d’leisa kaman. (Is that how we understand ruba d’leisah kaman? I can’t recall.)