Lisa Su in a later presentation/event announced that ROCM is no longer an acronym! So Radeon Open CoMpute is no longer the definition there! But ROCm/HIP and CUDA/CUDA Tools, and OneAPI/Level-0 are essentially the same coverage/scope for AMD, Nvidia, Intel respectively as far as GPU Compute API support goes and HPC/Accelerator workloads as well.
So there's a YouTube Video from some Supercomputer conference where the presenter goes over the support Matrix info for ROCm/HIP, CUDA/CUDA Tools, and OneAPI/Level-0 and they are similar in scope there.