Banned =/= deleted. Accounts aren't deleted, presumably in case they need to be recovered at some point, or to keep records of some kind.

Time Period: May 15, 2014 to May 21, 2014
- Accounts receiving disciplinary action for RMT advertising: 939
- Accounts receiving disciplinary action for RMT/illicit activity: 598
- Action Details: Permanent ban from FINAL FANTASY XIV

Time Period: May 22, 2014 to May 28, 2014
- Accounts receiving disciplinary action for RMT advertising: 839
- Accounts receiving disciplinary action for RMT/illicit activity: 618
- Action Details: Permanent ban from FINAL FANTASY XIV

They just banned over 1700 accounts in less than two weeks from advertising alone, so yes, I'd say they definitely do ban them. It's safe to delete blacklist additions more than a couple days old, anyway, because even any that may have slipped through the cracks (it's impossible to tell for certain which are banned and which aren't, if any) are no longer going to be sending out tells.