Must be a coincidence that Americans know about the June 4th Tiananmen Incident and not the April 5th Tiananmen Incident, which was demonstrably more important and actually left a huge effect. This must surely have nothing with American propaganda

Or that Americans think that Chinese people just don't know anything happened on June 6th. Here are the events of that month listed in the Communist Party's own website:
http://cpc.people.com.cn/GB/64162/64164/4416141.html

Or that Americans think that Chinese people don't know about the student movement of the 1980s. Here's that article from Baike (China's counterpart to Wikipedia)
https://baike.baidu.com/item/%E5%85%AB%E5%85%AD%E5%AD%A6%E6%BD%AE?timestamp=1619542036516

Looks like this is gonna be a thread of Chinese internet links containing the "cEnsOrEd" June 4th Tiananmen Incident.

http://lishi.zhuixue.net/jindai/89589.html

http://new.zlck.com/rmrb/news/C9WWUBWV.html

http://new.zlck.com/rmrb/month/198906.html

http://new.zlck.com/rmrb/news/BPUMC290.html

http://www.uname.cn/html/art/60/88_7389.shtml

Here's an unrelated article mentioning the June 4th Incident in passing
http://www.chinanews.com/2001-03-08/26/76782.html

Here's a website selling a book about it
http://www.jiaokey.com/bookpdf/300/594/660/667/1989/261719.html

http://www.huaxia.com/zt/tbgz/11-019/2431234.html

Here's another book
https://wk.baidu.com/view/08095d64bc1e650e52ea551810a6f524ccbfcb7e?pcf=2&bfetype=new

http://www.82ky.com/hdjr/lishi/18015

Here's an obituary of a PLA officer
http://mall.cnki.net/magazine/article/MMZG198908028.htm

Yet another book
http://www.dushu.com/book/10713387/ 

Government website
http://www.people.com.cn/item/20years/newfiles/c1120.html

http://pinlue.com/article/2018/09/2203/467323509644.html

http://www.law-lib.com/law/law_view.asp?id=51242

http://www.law114.com.cn/lishi_x.php?l=8&id=973&pid=1

Anyways, this is getting too long. I think that the "Chinese people get shoved into giant chainsaws if they mention tianmen [sic]" myth can be safely put to bed now.

Anyways, the insinuation that China has that mythical "Orwellian" attitude of "the past doesn't exist" is designed for the sole purpose of propaganda (and maybe to enable eldritch Reddit creatures to smugly jerk off while paying real world cash for "awards")

Read @RodericDay's article on June 4th Tiananmen! http://redsails.org/another-view-of-tiananmen/