Yes but in classic Amiga + PPC card systems you are killing one processor to a allow the other to function. If you have to kill the 680x0 CPU for the 603/604 PPC to execute then how is that multi processor supporting OS?
It isn't, no one was saying it is, and you're headed off-topic.
This thread is about new implementations of OS4 on new hardware that can support SMP (which the example you've given, even if both processors were used simultaneously, is not an example of.) OS4 on Classic is just about dead and buried.