Read the rest of the thread Curl ...
Sure I didn't specify but I thought people knew what I was going on about. Just because the WII U supports GPGPU (Well every console that had DX9 capable cards were able to do it so that includes PS360 as well.) does not mean that you will get acceptable performance and that especially goes for where the fluid occupies a large voxel.
Wii U's GPU isn't DX9 though, it's DX10/11 equivalent. Could it do it as well as PS4/Xbone? Of course not.
But the 7th gen situation, where there were tons of PS3/360 effects Wii just couldn't do, has not been repeated as this time Wii U is much closer in functionality.