Last I noticed was a few days ago, he posted in a thread (I forget which one) in the Metrology section, complaining that his post in that thread had been deleted. I have no idea what the deleted post contained.
When Barbter got banned I was forced to eat my words as it turned it out it was actually Milacron that banned him (Gordon's obvious involvement notwithstanding).
I'm not inclined to give anyone the benefit of the doubt this time, no way it's a database glitch, and no way it's a coincidence that this comes immediately after another squabble in the metrology sub.. I might at a stretch believe "account accidentally deleted while attempting to place ban"