The tianamen square protests were no actual witnesses saw anything happen and we're every alleged eyewitness have been proben to have lied? That.protest? The protest where "people were mushed up" but all fotos of the square show no such bodies (except for police officers that had been lynched by the protesters)? That protest?
The protest were the most famous video is of a guy blocking tanks who is then peacefully escorted away? https://streamable.com/unjnw9

Also define authoritarian