because Yuzu acknowledges their software can’t run without the Switch’s decryption keys.
That's a failure on the DMCA, not on Yuzu.
The law clearly establishes the protection by which you are allowed to make a personal backup copy. Yuzy thus should by design allow you to play this backup copy, as would any other emulator that actually did its job. If you need to break DRM in order to get your own keys to play your personal copy in the first place, it's not Yuzu's fault, it's a DMCA provision that has been put n place without forethought on how it clashes against the use provision.