His claim is that AI somehow went back in time twelve years and made weird racists posts about being a "black Nazi" on a porn site because that's apparently how he thinks AI works lol
"That's not me" would have been a simpler explanation than somehow AI cracking this user's credentials, signing in, hacking the site to post in the past, generate the content, post it and then distract the sys admins so this fatso Nazi could get smeared.