Yep - desperate sniping, it seems, and old news regarding an amatuer-ish test of SANSI...
What does it prove? Hard to say from just the film...and may depict a response unique to the tethered test and not a response that would be encountered in untethered flight.
Professionals would recognize this; perhaps they did.
Doesn't mean much without complete factual information/context, especially SANS2!