You have it right there. If he is posting intentionally innane comments, asking intentionally provocative questions, and posting spam… well…
Here he is provoking people in another thread.
Go here and just search this thread for his name. It is very apparent how he strings people along asking the same questions. He likes to regularly bump it just for that reason.
Here he is using an alt to reply to himself.
Here is where he bumped a LGBT thread just to see if he could get people to fight.
Here is the post where I called him out before he hid his profiles. You can see a few more examples of his trolling I used then.
How did I find those posts and all those alts? Easy. The sheer quantity. Look for stupid inane and/or necroed posts, he is responsible for a lot of them. This isn’t a 1 off of someone said something silly that didn’t land or found an old conversation interesting. This is consistent behavior that surprised me when I saw it went back over a year. He is pretty good at staying under the radar, as he did with you. Now that you’re aware of it, you will see it more.