They literally sort of did. You couldn’t leave your house unless you tested negative, most businesses shut down, you could be fined or worse for being outside with an expired test or positive test. Food was provided to you at your home, so you didn’t even grocery shop. They were the among most successful at preventing deaths, and immediately after zero covid, many people died. Unlike here in the US, where most people you meet know someone who died from covid, I’ve yet to meet a Chinese person who did. My wife thought covid wasn’t a big deal because she knew no one that caught it and no one died around her, she didn’t believe me at first when I said over a million people died, and was aghast to find out people purposefully refused to wear masks here.