I think he thought it was deleted.
Based on the fact that he said it was deleted in the link I posted.
Maybe it had been building up for awhile. Maybe he was unhappy with the moderation policies and decided that if his posts were edited, deleted, or... yes even moved... he was out of here.
22000 posts, 90% of which were incredibly helpful. Many of which were among the most helpful posts ever made on this forum.
I'm inclined to cut him some slack rather than jump all over him based on some flimsy assumptions.