Thanks for the link. Those are the professional cards. For consumer cards, the only supported models on Linux are the 7900 series and Radeon VII according to that. Interestingly, all of the supported cards aside from Radeon VII have 24GB of RAM or more as if high VRAM were a prerequisite for support.
Seeing this, I am not surprised I misremembered the state of RDNA support in ROCm. The support matrix it pitiful compared to Nvidia’s CUDA support matrix.
The official support list is anemic, but in practice, any RDNA 2 or RDNA 3 GPUs will either work out of the box or can be made to work without much difficulty.
Debian has a particularly good compatibility story. Its ROCm packages carry patches to work on all discrete Vega, RDNA 1, RDNA 2 and RDNA 3 GPUs. That's not official support, but it is tested.
Seeing this, I am not surprised I misremembered the state of RDNA support in ROCm. The support matrix it pitiful compared to Nvidia’s CUDA support matrix.