

It is true and has been my experience for the last decade or so. Unfortunately, OP is trying to use a GPU from 2015 that’s still based on GCN 1.0 with the newer amdgpu driver stack, which is not officially supported. Effectively, OP is getting a taste of what it was like before AMD started pouring ressources into their open source GPU drivers.
Most gamers don’t specifically follow gaming news or keep up with all the latest scandals (of which there are too many to keep up with in any case), but they will notice if the nostalgia project they’ve been looking forward to is suddenly gone.