I searched and found only the below which says either no drag or very low drag. Obviously my search foo is failing.
It would seem it is, yes, perhaps similar to your drag detection foo?!? If you want the proof, pop your bike in a workstand (mind your back as you lift!), then pull back on the upper chain run. Remove the bike, pop a non assisted bike in the stand, and pull back on the chain again. Do let us know how you go...