I don't think it needs to be deleted. Better it stays here because then those who do want to try this can see the dangers and how you deal with them. You cannot stop others from trying something by denying that it exists, you can only advise them of the best way to do it without harm and let them make their own choices with all the facts in place.

If you did want to delete it, you need to talk to the admin types and get them to do it, giving them the reasons why you want it deleted.

Alternatively, you could edit your entries in this thread - removing all the text and replacing it with a comment like 'deleted for... whatever reason'. However, the thread and all other entries would remain.