Re: Not my field of expertise
I'm currently writing GDPR cleardown procedures for people that no longer need processing.
When the cleardown is run, the unique id for the person is stored, and the date it was deleted. This cannot be tied to any personally identifying data by itself. Nothing else is retained.
In the very unlikely event where a customer accidentally sets a person to have left years ago, dated some time ago, and the data are mistakenly deleted we can tell them when it was deleted. Can't get the data back, of course.