Are you a lawyer?
It's beside the point whether he's a lawyer. He's not your lawyer, that's for sure. The "no medical nor legal advice but otherwise you can advise anything" idea is beyond stupid.
Judge advice on its merit, not by what category it's in.
This is not an absolute fact.
It depends entirely on the commenter's jurisdiction.
Which jurisdiction? Under what circumstances? Who enforces these purported rules?
I don't need to ask whether you're a lawyer, you're simply out of your depth I'm afraid.