I've been doing research into this topic and I came across this page
https://github.com/rvido/iManager
which seems to be the actual kernel driver for the IT8528 chip and when loaded exposes the sensors via sysfs which I believe is what the Dynamix Auto Fan plugin requires. I don't actually have a machine with this chip yet nor unraid setup so I can't try this out myself, however, would someone like to try compiling that driver and loading it to see if the fans can be controlled from unraid?
Edit: it seems the IT8528 chip can run custom firmware and even though this driver is designed for this chip it is for different firmware.
Thanks,
Harry