I just started learning a little CUDA, but otherwise I know little about GPUs. Is it surprising that they are Turing complete or surprising that they are using

I just started learning a little CUDA, but otherwise I know little about GPUs. Is it surprising that they are Turing complete or surprising that they are using a von Neumann architecture? You seem to be referring to Turing completeness when talking about branches. von Neumann architecture means you can execute data as code, which seems to be more what the presentation is about (?) Given that CUDA exists, I don't see why it is really surprising that you can do advanced things with OpenGL shaders, given that they are running on the same hardware. CUDA is definitely turing complete and I think OpenCL is the same.