Yes, you are right. Family law is indeed different but I understand your point.
I found two cases similar to ones that he has posted.
Like for these ones that involve these types of cases the cops/law enforcement would not just be able to arrest him because of a post. They need evidence like fingerprints, IP addresses, pictures, video footage etc. that he did something wrong which he didn't because he is posting on other's behalf. He will not do this anymore, but for these types of cases he need not worry if he never really did criminal right because the cops need more than just a post to convict him?
And for the disclaimer, he tells the people he talks to that he isn't a licensed lawyer yet and that while he could provide them with some information/knowledge he can't give them official legal advice. That is only provided for by a licensed attorney.