Have you looked at this? Lots of good info.
That is right. The canbus network is between the PCB and the motor.
I think so 
RVC isn’t tied to the motor at all. If the PCB supports RVC ( I think it does), then you can use RVC if you want.
That’s correct.
That’s the link in the original post found here? Any chance that could be fixed or updated @andyinv ?