Isolation is one factor, but industrialised countries with closed borders (like the US and Canada) aren't comparable in both deaths and cases. So it's a valid comparison for non-EU countries.
According to that article, which I don't fully trust*, it requires people to check in to every place they go, which enables contact tracing. 2 things:
Google, FB, etc know down to about a square meter where I am (and what I'm saying, etc) all the time. So the information is out there, and is used for better targeting ads which I block, rather than either something obviously nefarious (govt tracking dissidents) or something useful (contact tracing).
Secondly, I am in a university in the US that had a good covid record. Just like in China, I have to sign in with a university-built app, submit my symptoms, and tell the app I am entering campus, and swipe my ID card every time I go through a door. I have to report for random covid testing 1-2 times a week on 24 hours notice, if I don't all access is stopped and I have to get it cleared with the head of department. Since this is the only way to enter my lab and do my work, I would have been kicked out of the university and country by now if I hadn't submitted to these invasions of privacy.
In return for giving up these freedoms, Chinese "babies get to meet grandparents", "people in relationships get the chance to meet", unemployment numbers aren't insane, etc. Oh also less people dead.
*i know some people in China and while they use the app a lot I don't think it's as pervasive as the article describes, I'll ask.