Tried it, could not get it to run on my RX570. Read conflicting information whether that series is still supported or not.

rocm-smi detects the card and shows me the temps etc., but rocminfo throws an error.

I found this repo which should apparently fix it, didn't change my situation though: https://github.com/xuhuisheng/rocm-gfx803/

what does APU mean here?

Cpu + gpu on the same die/chiplet thing. So integrated gpu in and marketing speak is apu

Amd's integrated gpu together with the processor.