You are bad at remembering events correctly.
1. Fake Null's debate happened before the Falgi incident.
2. Dansburst debated Fake Null because he thought he was the real Null. I really don't think this sperg is pathetic enough to specifically go after people dumber than him esp when he thinks he's a 300 IQ intellectual. He went onto debate bestiality against libshit Hunter and thought it'd be an ez win.
3. As pointed out quite a few times already, he argues his retardation from a "logical" perspective and then goes "oh, if there's rape I'm not in favour of it". He absolutely does understand the legality, content and consequences of pedophilia and zoophilia, but he's a zoopedo, so he argues for zoo/pedophilia because he wants this degeneracy destigmatised. He doesn't care if it does harm, he's a sex pest, end of the story.
You can ask Weenie Hut Jrs on the thread about him if he's still around, he'd probably know more because he has firsthand account of the autism on the server. He's also friends with Fake Null and posted the full videos of the debate for reference.
Or you can ask Skibidi Biden who also seems to know what happened on the server.