Your comment reveals that you don't know what you're talking about. Very fast cars are rare so their rate of acceleration looks strange to someone that's not used to it.
I'm curious as to why you choose to believe that their was a conspiracy to release a sped up video rather than the fact that the car really is just that quick. Cognitive dissonance? Shorting Tesla stock?
It's not like you're mentally deficient or anything so there has to be a logical reason in your mind as to why you ended up thinking this. I would be very keen to know what that is.
I don't think it's altered video. I'm just describing possible things that people could see in that video, which might lead to that conclusion:
1. an odd camera motion;
2. scared spectators jerking; or,
3. altered video.
I do, however, think the people downvoting me have significant reading comprehension problems. However, that's a thing they will have to reflect on, internally, and has no bearing on me.