I just had two messages deleted by Proton Administrator.
I get notified by email with this short message : 

"Hi, please report this through the "Report a problem" option on the app."

And so... since you deleted my contributions, if I had not by chance corrected their text in my AI chatbot, I would be left without any copy of it and would be forced to re-write them from scratch.

So a copy of the deleted contribution should be included in the deletion contribution.