That could have changed, sure, but nothing indicates that is the case.
You could also go the GDPR route and request all your data be deleted, if you are subject to that. They would be forced to comply with that request.
but if you overwrite first with garbage then delete that's what shows up in the dump
Do you think they are going to go through each of your comments individually to determine if it contains personal info or not? That requires actual time and effort, and as an individual user you or your comments are nowhere even remotely in the vicinity of important enough for that.
It’s far easier for them to take the loss and delete wholesale.
Do they do this? I don’t know, I haven’t done it. But it certainly could be argued that by them not doing this, they are not fully complying with the requirements of a GDPR deletion request.