This is exactly what shadowbanning is for. You can see what Terry posts by opting in to do so.
It could be argued that he would simply create another account and continue posting if his account were banned. That's one assumption, but of course, the shadowbanning system seems based entirely on assuming things about people. Creating another account if you discover you've been banned is what you're supposed to do, is it not? For all anyone knows, he would have moved on long ago if not for the way this site seems to act to keep him here.
Meanwhile, every now and then you read a post from someone who discovered they were banned for months, or years, for some slight they weren't even aware of. Apparently someone flipped the switch and decided they needed to go away in the most passive-aggressive way possible.