AMD does seem to be trying to goose PCIe 4.0 demand by making some of it's products perform best with it (which is a mistake IMO, since it makes their competitors products more appealing) but it seems like the 6500XT was originally a mobile chipset so it wasn't really meant for the DIY desktop market. But shortages meant it was pressed into this duty anyway.

I was reading a techpower article on the 6500XT recently, because their power usage testing is excellent aand the 6500XT has an incredibly low idle draw versus other desktop cards.