depends if the relay keeps a register. It can, such as with the piramid system. But at that point that is a particular account you have with that relay, and as such your ID is not an account. You can have all sorts of accounts in all sorts of places for all sorts of reasons based on your npub, but that in itself does not make your profile an acount. This is different with the platform model, where the ID and the account are the same thing