While there’s no official docs from nvidia regarding D3 on ryzen, it seems it only works on ryzen 5xxx models and is disabled on 4xxx and 3xxx models.
https://forums.developer.nvidia.com/t/runtime-d3-support-on-lenovo-legion-5-ryzen-7-4800h-gtx-1660ti/192673?u=generix
https://forums.developer.nvidia.com/t/is-rtd3-supported-on-ryzen-4-series/189595?u=generix
https://forums.developer.nvidia.com/t/using-runtime-d3-rtd3-power-management-on-geforce-gtx-1650-notebook-running-on-linux/179201?u=generix