Signatures that are not in the signature line are banned.
I understand they are discouraged but not banned. Do you have a reference for that?
This post from theymos clarifies that only valedictions or names are discouraged. All other signatures are banned:
Yeah, that's not allowed. Any signature must be in the signature area. (Except that a traditional valediction or just your name is allowed, though this is discouraged.)
I removed the existing ones. Anyone who continues posting them will be banned.