I'm not familiar with the tile-specific stuff Apple is doing but I think the grain of truth in that thread is some graphics apps on Apple silicon will perform better if they use them. The rest of the thread is doesn't make sense to me.
If you want an idea of what GPU programming is like you could look at some CUDA intros:
If you don't have CUDA hardware you can get various versions of OpenCL that will at least work on your CPU. Lots of interesting compiler stuff happening targeting GPUs.
If you want an idea of what GPU programming is like you could look at some CUDA intros:
- https://developer.nvidia.com/blog/cuda-refresher-cuda-progra...
- http://cuda.ce.rit.edu/cuda_overview/cuda_overview.htm
If you don't have CUDA hardware you can get various versions of OpenCL that will at least work on your CPU. Lots of interesting compiler stuff happening targeting GPUs.