Those are not conforming! They have nothing to do with Figure (those are simple props).
And: most props can be called "dynamic". Here dont even try to run simulation on them since the belt is not one geometry (it's made of couple separate pieces so the effect is going to be "strange") but the mask is (one geometry so it can be ran through symulation without problem, but not in your case since it becomes automaticly parented somehow).
And yes I could parent them (not conform!).