Three things:
1 I think nvubu is correct to direct attention to that thread with regard to the question of banishment. There are several posts by PPRune Towers that give a pretty clear indication of the reasons.
2 I think we should be very careful about "playing the man" on pprune, and questions as to why a particular person was banished will lead us into that trap.
3. I would break my own rule (see #2 above) if I were to opine on why that particular person was banished, so I won't. But good riddance, I say. I'm open to PMs.
More than ever -- Stay Safe