We all know that the motor disengages, but people seem to not realise that the larger bearings, seals, heavy axle and extra weight of the 'clutch' mechanism are all extra rotational friction. So, compared to an acoustic bike, YES, there is more resistance when pedalling an e-bike when it is off.and that proofs 'the drag from the motor' almost doesn't exist
This rotational resistance is exponential in that it becomes greater the faster you go!