However the tweets of a deceased person can contain personal data of an alive person. How do they handle that when the author can't agree to changes of policies anymore? But how can FB's memorialized accounts handle that?
The GDPR angle is that this was why they decided to indiscriminately delete inactive accounts. Deceased users are the reason they're delaying it, not the reason they're doing it.
Recital 27
> This Regulation does not apply to the personal data of deceased persons.
> Member States may provide for rules regarding the processing of personal data of deceased persons.
Each country has its own rules. This is a summary https://www.twobirds.com/en/in-focus/general-data-protection...
However the tweets of a deceased person can contain personal data of an alive person. How do they handle that when the author can't agree to changes of policies anymore? But how can FB's memorialized accounts handle that?