I think it was already broken?

37C3 - Full AACSess: Exposing and Exploiting AACSv2 Uhd Drm for Your Viewing Pleasure https://www.youtube.com/watch?v=SEBuiecLZGg

Apparently that's been on the way out for a while now: https://news.ycombinator.com/item?id=32442894

Now I'm curious, thouyh: Have there really never been any software Blu-ray players supporting AMD?

Blu-ray is fine, it's Ultra Blu-Ray (aka Blu-Ray 4k) that needs SGX for officially licensed playback. No AMD support there. But non licensed play back is fine.