I do click the refresh after each open/close of the application. I know it caches the proviso test run. You have to hit the refresh to get it to tests the current setup.
And to what I did, I'm running the latest Whatevergreen, SMBIOS iMac19,1, iGPU disabled, made sure to remove everything from Devices->Properties for the iGPU in my config.plist, and I'm running AptioMemoryFix-64.efi for my memory driver.
Not being in the Graphic arts or video work industries I've not tested this setup with Final Cut Pro, I've relied on the test from "VideoProc" and the output from Hackintool "VDA Decoder" = Fully Supported as signs that my rig was using with the headless iGPU or the dGPU for video work offload.
Are their other tests I should run to verify my setup is truly using the dGPU for video processing work?