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
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Checking sources twice is something you should do from a news agency that is actually reputable. As in it trades on being honest and accurate.
You’re not obliged to read everything from an outlet that has no track record of honesty and integrity simply because you’ve been beaten around the head with the internet ‘logical fallacy’ meme one too many times.
Thinking that everything you read on the internet should be worth your time to fact check is the ultimate logical fallacy.