Again IANAL (and am not privvy to details here) but just from an operational compliance perspective: anonymization is indeed a process that’s valid, but has rules, best practices, precedent, and so forth. It’s routinely applied to datasets with public-facing content but it’s not some kind of trick for evading individual deletion requests from users who have identified themselves and are already publicly associated with their content in close-knit communities (if verifiable anonymization is even feasible in such a case, which I doubt).
My advice would be to make a list of your content and politely send with the template to the instance admin (not the mods). I’m sure they’ll just delete. Seriously, no content is worth the headache.
Classic Appa!