Send him an email, there's no harm in it. The only way you can fuck up doing that is if you make legal threats. Just don't get belligerent or you risk more attention on the thread. Change your name as an extreme option if you're so worried about this being connected to your identity. No idea why you have a thread, but if it's to do with illegal activity/ drugs etc there might be services you could go to that would help you in finding employment.
Judging from some posts underneath me, I think you'll be driving attention back towards your thread if you request it be taken down. I do remember him having votes held for threads before. It's not something he'll do without notifying anyone. Unfortunately that might mean that users will look into what you're doing at present too and will renew some interest in you. Whatever you do just be sure you're comfortable with and accept the potential consequences. If you're living your life quietly without hurting anyone, there's little reason to keep your thread up. If it's been years since it's been active then you're obviously doing something right. That works in your favour. If whatever you've done has anything to do with kids, animals or potentially trans stuff you may be out of luck.
Null has a nuanced stance on things usually, but has stated that he shuts the conversation down immediately the moment any allusions to legal threats are made, You'll see every attempt at that made in the "take that off the goddamn internet" board.
