Not sure on the technicals but lots of rate limiting to prevent PDS from being able to get everything and outright shenanigans to make posts not appear in the old view which also prevents PDS from deleting them. Not to mention un-deleting comments after a while (even if you use the option to edit before deleting).
So run it early and run it often. And then just delete the account for the rest.
They’ve done a lot to neuter that.
Not sure on the technicals but lots of rate limiting to prevent PDS from being able to get everything and outright shenanigans to make posts not appear in the old view which also prevents PDS from deleting them. Not to mention un-deleting comments after a while (even if you use the option to edit before deleting).
So run it early and run it often. And then just delete the account for the rest.