Without a reason?
You've spammed in each forum and a lot of your posts were deleted. You deserve that ban. I gave you a warning to stop saying the same thing or you'll get banned by me but, that doesn't mean other staff can't ban you as well for breaking the rules.
You were banned for new content and not an old one meaning, You didn't stop for a month or two, you stopped for 12 hours or even less and he had the right to ban you.
The ban isn't long and still considered as your warning. My warning was simply there to help you not to get banned. It wasn't official, if it was, you'd have been banned from having 3 points (Infraction).