Well, he was making posts up until just recently..
That's uncommon of trolls.. it may simply be a case of the mods
letting the prey thrash about a bit while the sharks feed.
You're right, it's not routine. I followed approximately 2 dozen "post and run" trolls this month. The left is really in a panty-wad panic.
Hopefully the Mod will issue a major ZOT now.