I also tried loading 19.07.4 EA8300 build on it. I agree the ethernet switch doesn't work. But the 2.4G and one of the 5G (ch 36-64) works. The other wifi likely just needs the 9884 driver included in the build.
Here is the boot log:
This line is suspicious:
[ 1.345687] ar40xx c000000.ess-switch: Probe failed - Missing PHYs!
Maybe this is relevant: [QCA8072] cannot initialize ess-switch