The MI50 may be considered deprecated in newer releases, but it seems to work fine in my experience. I have a Radeon VII in my workstation (which shares the same architecture) and I host the MI60 test machine for Debian AI Team. I haven't had any trouble with them.
I don’t think the mi60 has reached deprecated status yet (the last time I look at prices for the mi50 and mi60, the mi60 was something like 3x expensive, and I think thats because its still officially supported), but I’ll check this all out. Thanks.
I had the impression Debian applied patches that widen arch support from what upstream officially supports, including for the MI50/MI60.
https://salsa.debian.org/rocm-team/rocm-hipamd/-/raw/d6d2014... (one patch of many)