A seven day posting ban would do wonders in my opinion.
That's a good idea, though I'm not sure mods are meting out that kind of punishment for necrobumping.
I did report that bump when I saw it, and the post wasn't even on-topic. And yeah, breaking two rules at once is a good indicator that this guy doesn't care about the forum--it looked like a bot, actually.
That thread probably does need to be locked, but I'd say a member like this would just find any of the hundreds of thousands of old, unlocked threads to post this garbage in, and locking them one at a time might not help much.
So are they doing it for account sales, or for junior rank sig spamming?
Or they could be doing it to be a nuisance, which I've seen a number of bots do. I don't see how anyone could be gaining from this, and I would think they'd have to know these posts are going to get reported.