You can't present "I know someone . . ." as an argument. There's something called prima facie evidence, which means that if your evidence is a person, you have to produce that person. You can't speak for someone who isn't present.
Of course. And you must realize that this is not a court of law, but a message board.
And what we are all participating in is not a court case, but a discussion. Which has somewhat different rules, including those of courtesy.
I have, BTW, neither objections to AA nor to critiques of it. I have seen previously one reasonable and objectively stated critique of the program by someone well qualified to comment on it. However, in that case, IIRC, the person was simply commenting on why AA chapters sometimes fail and sometimes succeed.
I've never had a drinking problem---barring excess puking---but I feel for those who do. If AA has been helpful even to a small number, I personally am not going to knock it.