I don't recall the events surrounding him leaving, and I don't remember him posting anything on the board about it. In fact, while his profile shows he's banned, I don't remember which of us banned him, or why.
If a person decides they want to leave a site, that's their prerogative, no hard feelings. But I can't imagine why they'd want to take all their tabs down. I certainly understand feeling proprietary about them and not wanting others stealing them and taking your credit for them, but the point of tabbing is to help aspiring musicians, so why put in all the effort to make loads of tabs, only to later strip them all away from them?