the servo was moved glitchlessly by the yotamarker, as shown in the video.
I have pretty much solved sapator's request (to get someone to test or somehow prove there wasn't any record tricks) I concluded that an "authority" such as a proffesor, reporter, celeb are not reliable or objective. in the video you see a second guy, there is no way even for the best of actors to fake his facial expression of surprise as the motor moved by the yotamarker's will (the same for when she made sounds).