US mainstream news outlets like CBS News with actual reporters on the ground at the time: https://www.cbsnews.com/news/there-was-no-tiananmen-square-massacre/
Classified US communications with assets on the ground: https://wikileaks.org/plusd/cables/89BEIJING18828_a.html
Image Analysis
They also refer to the Ukrainian government as a “Nazi regime.”
Your choice, but choosing to believe that site is plainly asking to be lied to. Advising others to “check sources twice” is pretty laughable in this context. This is unintelligent and blatant propaganda.