does a twin engine lose its gyroscopic properties of inertia?

[raaaid]

once in a physics forum from which now im permabanned i was brought down an argument which would violate conservation of moment by the main thinking head of the forum on the basis that two counterotating gyros as can be a planes lose their increased resistance to spin since theyre counter rotating

i feel he scammed as ive seen him lying another time not to disprove certain dogma

so my question:

a two propeller plane offers the same resistance to yaw when at full revolutions that when stopped?