I feel really really concerned about the fellow. It must take an enormous amount of work to do that kind of sockpuppetry. I wonder why he feels so invested in his presence here? Maybe we can address this therapeutically rather than legalistically? Maybe he enjoys the drama the most. I hope he'll just grow out of it or ask for help soon :)

I can imagine him taking the opportunity to defend himself as a chance to grandstand. He can give a versatile Pearce excuse/justification/reason that repositions himself as a victim:

I'd like to unreservedly apologise to everyone for my actions over >x amount of time<. My behaviour was unacceptable. I'm embarrassed and take full responsibility for my actions. I acknowledge I have a problem with >behaviour< and it is something I have to address. It is not an excuse but a realisation that I finally need help.Together with the >ingroup< I'm working on a solution for me to address these issues that will come out in the next couple of days. I just want to thank everyone for turning up and I apologise again.