just saying "script reverted it" isn't going to save you

I feel like this would actually be worse than someone doing it manually, in terms of GDPR.

I doubt Reddit is ever going to check all these comments manually to see if they do or do not contain personally identifiable data. They have to delete this data. The data also doesn't have to be "hi my name is X and my address is X", it can be anything that could be potentially identifying, on its own or in combination with other identifying data.