But there was a level entry form. So he entered it, but then disqualified it? Or someone else entered it on his behalf?

Ahoyo hosted, and lots of creators were invited to submit. When Ahoyo discovered TASing tools for WiiU, TTH was his way of showing it off. With a tendon issue, they couldn't make and play a hard kaizo level anymore. So, yes, Ahoyo entered TTH themselves, then made sure it was disqualified. The point was for people to see the playthrough and accuse it of being a TAS, which would be the reveal, as per Ahoyo's message. The viewing of the levels with the judges was live streamed, so the audience was supposed to see the levels and call it out, too.

Then no one noticed, and the TAS tools seemed to have died out. <strikethrough is broken for me for some reason, just assume some nonsense here>

Edit: My bad, I heard talk of TASBot trying to get their jank tools to work for WiiU, I didn't realize this but someone has already cleared TTH with TAS. Just those streamers going for last 7 days of RTA clear attempts.