Source? I did a cursory search for "GDPR" on the GitHub issues and can't find anything like that.
Anyway, this seems to be their more recent stance:
For the future, any GDPR compliance advice needs to come from a lawyer, not from random non-lawyers interpreting what they think is correct.
https://github.com/LemmyNet/lemmy/issues/4540#issuecomment-2018920191
Reddit was literally co-founded by Aaron Swartz (RIP): https://en.wikipedia.org/wiki/Aaron_Swartz