This should be a good PSU: https://rog.asus.com/power-supply-units/rog-loki/rog-loki-1000p-sfx-l-gaming-model/ However, it didn't solve the motherboard coil whine.

I'm monitoring the SFF discord communities and I haven't seen any reports of coil whine with other vendors. On the contrary, people say they are completely silent. For Asus boards a lot of people reported coil whine on B650e-i even after RMA and a fe...

AMD CPB doesn't change anything. Currently, the only workaround is core voltage increase(try to get idle voltage above 1.2V). But this is not acceptable. What is a good vendor validated components configuration?

I agree with everything you mentioned. However, there is one specific behavior that doesn't fit in any of those categories. The ROG Strix B650e-i doesn't have any coil whine during changes in current demands  or high power demands. The coil whine app...