He's been an active member here for more than ten years and has over 2600 posts.
He's not a disputatious troll, either: he sort of sits on the sidelines and typically comments only when he has something worth saying.
Again, the guy is a lawyer, or he may be a retired lawyer, I'm not certain which, but it's one or the other.
He said he "confirmed" KJ's story of being backroomed: with his legal background he knows about issues of proof, and he believes it to be true based on what seems to be independent investigation.
That's good enough for me: why can't you accept his word for it?
BTW I like his handle: it is "SINGER" spelled backwards.