I don't think anyone was fooled there, just aswell as no one was fooled in the other linked post. What the trounced-by-MMA-fighter Kiai master did beforehand was simply no-contact sparring, meaning he would imitate the actions he would do based on what the students were doing and them would react vice versa. It's a great way to showcase a form without any risk of injury and fairly regularily used as telegraphing and stance practice, where the instructor would react to what an attacking student is telgraphing or how he would attack them with their current stance. Usually it does not come with such exxagerated falling-over yadda-yadda as students would be more encouraged to learn from their openings.
It is also a great way to promote the school or show off, because it looks cool when people are emulating a fight with Hollywood-esque flailing about. It makes viewers go "oooooh, that looks awesome!", which would be the entire point if a school wanted to promote itself to attract new students.
That said and back to my initial point, I am convinced no one can fool others into thinking he could push them around without touching them. The human mind for starters doesn't work like that, either you are being pushed, or someone is ineffectively waving his hands at you and you wonder why the hell he's doing that. Fooling oneself into believing one has some powers like telekinesis or whatever is possible, but usually a phenomenon that's exclusive to isolated cases, as the hard reality of someone not just being blown away with a handwave again makes your brain automatically go "what?".
I simply think those where choreopraphed shows. After all, a good deal of martial art forms do have a penchant for theatrics and some schools downright do theatre to simply make learning certain stances or techniques more fun to practice, so it's not unusual for schools to make little plays which are subsequently showcased on tournaments as a form of entertainment for example.
There are however of course the odd couple of frauds who work together with some people who do such choreographies and claim them to be real just to milk a couple unsuspecting people into paying bucks for recieving training in supernatural martial arts, but in general such black sheep keep to the backyards to avoid being exposed as frauds.