O I was going by the comment made by the guy who ported Lightrec and assumed PPC support meant it would work on WiiU out of the box.The main issue with pcsx rearmed is it requires mmap, which we don't have on current wiiu toolchains, also in order to get lightning we need to port it to the wiiu, even if lightning supports PPC! With Mupen64Plus Next and Flycast things are harder, we need OpenGL support for wiiu hombrew, which is a PITA considering how complex GX2 is.
I heard WiiU lacked mmap but thought it would be relatively easy to implement (compared to porting a Dynarec)
I always thought Mupen64/Flycast would be a no go on WiiU without serious effort because of the lack of GL on WiiU.. GX2 is similar to GL just not enough for it to work. Then there's the lack of PPC Dynarec's for those on top.