Update:
#Purism has decided not to honor my request to be removed from their #purismforums and be provided my data, stating:
We will not delete the anonymized accounts or posts
To #purismforum users, I do not consent to any of what has happened, and I recommend abandoning that site.
To users who stay there, never link to my projects or my socials and never mention me, my socials, or my projects ever again.
For those wondering:
I find myself in this situation because transphobic posts harassing me were allowed to remain on that site while Purism moderators removed, hid, or censored some of my responses. My posts were calm, civil, and respectful, while many of the posts directed at me were none of those things. Purism’s moderators decided that it is acceptable for users to repeatedly post transphobic insults directed at a trans user, while it is strictly unacceptable for any user to say the word “fuck” in any context, including in a hidden thread that exists for discussions centered around the “politics” of pronouns.
Goodbye and good riddance
#FuckPurism
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.