Hardly. The quote is too inconsistent and appears to be a blatant lie in some claims. The entire planet's technicians wouldn't be staring at the hangar, especially if the energy blasts were unnoticed like he also stated. Kun's claim seems to be more of himself flexing his muscles than accounting an actual story. All we know for sure is that whatever technicians monitoring the hangar didn't see the event happen. Why that is the case can't be reliably assessed.
Oh lord.
This is very simple - Exar has can not literally know which technicians are motoring the hanger, unless he does a brain scan of every single one and picks out those individuals to manipulate. Easier solution - blind all of them to make sure no one can know what happened. The feat makes perfect sense.
Skip to 52:50, I quoted the entire scene.
The fact nobody replied to a Sith battleship attacking the city, indicates that he isn't just making shit up.
Clearly he had an effect on the people watching his ship come in, not very difficult. When Kun reaches the Iron Citadel, nobody had any idea who he was or how he'd gotten there. Both Aleema and Ulic had no idea he was coming either.
Contrary to that, they instantly reacted to the Jedi star saber attack and the city went on alert.