Deactivating is not the same as deleting.
When I did it I had to stay logged in on FB, open a new tab, Google “how to permanently delete my Facebook account”. Then the FB page which I couldn’t navigate to on FB showed up to delete account. After that I had to wait several months, not log in even once to make sure it was gone for good.
That was a few years ago. It may have changed.
“After that I had to wait several months, not log in even once to make sure it was gone for good.”
Yes. Me, too. The trick was NOT to go there to see if it was gone.