I thought this at first, too, but giving the author the benefit of the doubt, perhaps they meant that if someone deletes their account, you should actually delete their account, not just disable it.

I haven't seen anyone do this, but as a user, I would prefer an option for my account information to be emailed to me in a relatively readable format, so that I can keep my data / re-upload it if I ever want to undelete my account.