Ahh I rediscovered why I was confused. I initially came across this thread [RESPONDED] MUX switch toggle in BIOS? - #53 by Matt_Hartley last year and by the time I stopped following it the answer seemed to be “good luck getting the mux working on Linux” so over the year my brain turned that into “I don’t have a mux” as a coping mechanism I guess 
. But looking at it now there is an update to this article talking about how AMD brought support to the Linux kernel recently https://www.phoronix.com/news/AMD-SmartMux-Linux-6.17. So leaving this info for others who happen to find this thread
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