Memes

Not necessarily. You don't know why they're making that claim.

I live in Korea, where the letter of the labor laws are quite strong. However, they're not enforced. Workers don't sue companies because they're either afraid to rock the boat due to cultural norms or afraid they will develop a reputation and become unhirable.

Korea and China are very distinct cultures, but there are key facets that are common between them. Confucian (or at least neo-Confucian in Korea) values prioritize maintaining the peace and deferring to authority. This is one of several factors that causes Koreans to endure intense working hours, and I'm more willing to believe Chinese folks overwork a lot due to the few shared values.

You're also making assumptions though. And like pointed out elsewhere, mentioning Tiananmen Square still gets silenced so we're kinda forced to assume one way or another and I generally don't believe the state that is doing the silencing. That's not racist and it's messed up to jump to that accusation so quickly