There's nothing there which clarifies that "delete" isn't a euphemism for "flag it to no longer be displayed to users" like it is everywhere else where companies collect data on users, so you'll excuse my skepticism.
"Well when talking about deleting we mean we do the exact same thing the file system does to a file, it flags it, but doesn't actually erase it's content. Acting like a filesystem delete operation is what people expect when using that word"
Not that I think that's legitimate! Implementations can be changed, just like you could write a filesystem that shreds files when they are deleted.