I don't think I ever found more documents on this feature. I assume it might need lots of users with matching result to ensure that bad actor can't upload malicious shader.
Thank you for linking, and it makes sure to say you have to have a certain set of proofs to make sure no malicious code is injected as a precompiled shader sounds like a great place for exploitation.
Tho i would expect (naive me) that the shaders at least might be cached locally - which is not the case since as i mentioned in my comment have to recompile them for every game every time i start.
I don't think I ever found more documents on this feature. I assume it might need lots of users with matching result to ensure that bad actor can't upload malicious shader.