Earlier quoted context omitted.
I don't have a horse in this race but in my opinion a more graceful way to deal with this is to freeze the account until the under-16 is over-16 so they don't lose their friend connections, history, etc... The under 16 should have time to add a comment saying how to contact them otherwise. Discord group, etc... There must be a reason to remove the account that I can not see.
Ideally they do lose all of that. That’s the root of the problem.
Where is the problem with this?
The problem rather is that the user did not create a private backup of the data that he wants to keep.