It's true that problems with diverging control flow work better on a number of cores than on a GPU. But by the same token a GPU's SIMT execution model does bet

It's true that problems with diverging control flow work better on a number of cores than on a GPU. But by the same token a GPU's SIMT execution model does better with ray tracing than the SIMD units on a CPU. And the article is about targeting SIMD units.