Really? I've done alot of research on Paul and his bass tone, not once have I heard of him using an ATK or Ibanez of any sort while he was part of Tool. He used the Ovation Magnum for Opiate (EP), Ric Chris Squire Signature 4001 for Undertow, and a Musicman Stingray 4 during the later end of his career with the band (was also used during the Ænima recordings and on "No Quarter" Led Zeppelin cover).
I think he was so excited he just posted the first place his mouse clicked on