SnackReally now? Enigma had no problem deleting Dashner's account and every single one of his posts when he was in trouble for sexual misconduct with fellow members of this very community! I see no reason why you shouldn't be able to do that for a relative nobody in this forum when strings were easily pulled for someone who was in potential legal trouble...
just my personal opinion, but I'm not sure why you're making it sound like enigma knew what dashner was doing and was helping him cover his tracks. i'm pretty sure this happened during the time enigma was checked out of tftv and focusing on over.gg. up until dashner had been discovered to be a shitty human being, he had been a volunteer for TFTV for years so I would only assume it was a courtesy by enigma who had no clue what was going on at the time with him (and mod discord chat with enigma after that happened confirms that)
as far as I know enigma is the only one that can do "bulk nukes" like that (since he has direct access), which is why mods have always said no to it; no one wants to spend their time manually nuking posts all day (also makes a mess of modlogs too)
as enigma (and you) said, what he did is more or less possible for anyone to do by editing posts and asking a mod to change your name. I don't know what bullshit you're referring to exactly but assuming it's for mods to have an option to nuke accounts, I do think it would be a nice feature to have tho