Plausible but still a GDPR violation.
Source: a privacy compliance lawyer working at a billion dollar European corporation told me that one day.
And as the parent comment said, you don't really have to delete them at all, keeping some sort of a copy that you ran through some sort of a personal data removal tool also works.
Example: years old closed support tickets, you'll never need to know exactly who made them, but you might wanna reference some info from them.