Saying the Tianamen square massacre didn’t happen is akin to Holocaust denial. It’s insane blatant shilling.

To me, these are not equivalent. Things are bad because they harm or promote harm to innocent people. A person not believing a particular, and controversial historical event, on it's own, does not make a person bad, insane, or mean they're shilling.

Holocaust deniers are typically bad people because denial of that event is part of their larger anti-semitism. It's an aspect of their hatred of innocent people. It is acceptance of genocide.

Denying that the events of Tiananmen Square in 1989 were a massacre is not a part of hating innocent people. It's instead based on not trusting the U.S. government, an organzation with an incredible history of lying, gaslighting, and media manipulation. Unfortunately, they seem to instead trust a different government with a similarly incredibly bad history.