I've read plenty of translated Chinese texts that mention and analyze the June 4th Incident. And doing a cursory search of The June 4th Incident (六四事件) on Baidu shows plenty of results. What you won't find are instances of people calling it a "massacre" or associating the Tiananmen Square with the event (which happened outside the square), or otherwise using it to further some ideological cause.
That being said, censorship is an important part of a socialist state. Being materialists, a Marxist-Leninist leadership understands that people are infallible, impressionable and easily misled. One of the first things Fidel Castro did upon taking Cuba was shut down or stifle private newspapers and initiate the building of state press arms – reactionary views can weasel their way back in if an admin is not careful.
Were a western perspective of the June 4th Incident be widely available in China, it would serve as propaganda given that the western perspective is deeply flawed.
Here's a summary of the events that really shows you how deeply twisted the western view of that night really is.