As a fellow communist, I was always bewildered by this urge of many tankies to prove by all means, against any evidence, that China is socialist and ultimately good.
It's neither. China turned to markets, privatized many industries, and really did commit atrocities on Tiannamen square and in Xinjiang.
Doesn't mean socialism as a system is dysfunctional. United States are directly responsible for insane atrocities all over the world, and we don't need to deny that either.
We need to learn from the experience and strive for it not to happen again. Not close our eyes, scream "blah-blah-blah" and pretend it never happened.
China and the Soviet Union were responsible for acts of genocide, mass murdering/starving people, etc.
Doesn't mean this didn't happen in a capitalist world, and doesn't mean we should close our eyes on that to defend the good look of the system. If anything, this does the opposite. Problems need to be solved, not ignored.