We always knew that it was a number substances... the issue has always been which ones are they going to be banned for. TB4 was always on the table and because of all the controversy about AOD and whether ASADA told Dank that it was ok without checking properly, it came off the table. But there were, IIRC, 15 or so other substances including the mystery drug from Mexico.
It isnt concerning at all really... it's quite a pleasant day for everyone... except those Essendon* delusionists...