Has it gone?
The question is, even if people delete their profiles and sign out, is the data gone? I'm sure it was Facebook's terms and conditions that I read some years ago where they claimed something along the lines of a perpetual, free, permissive licence to use anything you had uploaded, in whatever manner they chose. The implication was that even if you left the service, they could still use your pictures of aunty Viv for - I dunno - promotional material or something, and I'm sure the same applies to this metadata that "you" are uploading, simply by using the app.
This was one of the things that made me certain that I wanted no part of it all those years ago. Being part of it anyway, via third parties, is more than a bit annoying.
M.