Matt, your post to StackExchange is very impressive, as is your machine with a Threadripper!
What shows the problem & the answer is this:
"FCH device found but SMBus revision 0x59 does not match known values."
You installed flashrom as a binary package or app, but by now we have fixed the issues with the AMD boards with rev 0x59 flash chips even if it's not reflected in the binary packages yet. You will need to go to the Downloads page and get the source and compile it on your machine. The source you download has the problem fixed. Go here:
Actually the page only tells you where to go, not how to do it. After you make sure have installed the requirements listed, you will want to download thus:
Then navigate to the flashrom directory, do: make & make install
If that fails to compile, it's probably because you need one of the several linux utilities or libraries. It's impossible to list exactly what is needed as everyone's machine is different and often running different linux flavors. Just fix the missing dependencies and you will get it to compile:-)
Then try `$ sudo flashrom --programmer internal` or `#flashrom -p internal`
Best of luck, and let us know how it goes.
Clay