The best you can do is manually delete all your post. Seeing it's only few, it shouldn't be that tiresome. Next is to ask Loyce to delete your data in loyce.club as posts are archived there for safety purposes (more info:
https://bitcointalk.org/index.php?topic=5167469.0). I'm not sure if they would be willing to, but you can still ask.
Lastly is cloudflare or other trackers that may have logged related data, which is out of your control. This is our current state, unfortunately. It's pretty much impossible to completely delete your digital footprint since every company is trying to collect data and track us even without our consent, and that means it's possible that you wouldn't know A, B, C, company has data about you. Still, it's better than not trying anything.
Yeah, OP, you're stuck here forever :/. Even if theymos will delete your account, it will still remain in history. Once you post something on internet, you can't remove it completely later.
Many initial websites like Google Cache, Archive.is or various phishing Bitcointalk websites will have data about your account even after deleting it.