Yep, and people in religions say they're doing fine. Some of them probably are doing fine.
I admit that this survey could be biased because of people being afraid of their answers being monitored, and also that people in a country like China are probably somewhat brainwashed by the censorship in the media.
But you have to keep your mind open to the possibility that a human might balance all things in mind and with a calm disinterested choice decide that it's worth giving up privacy and freedom for a more peaceful, orderly, and efficient society. I know those aren't the values of many Americans, but Americans sometimes seem strangely unable to imagine that any human being could possibly have different values to theirs.
As a counterpoint, the US polls the lowest concern in the world for poverty and inequality. Yet there's no way in my mind you can look at inequality in the states and say "yeah, that's fine", but over 4 in 5 Americans polled said exactly that.
I am not saying that, people who are born and raised and live there say so (the small sample I speak to a lot). I find it hard to judge as an outsider although it definitely does not look ok.
Social credit is more than just a tool for oppression. (There's also more than one possible implementation currently in trial, but that applies to all of them.) Because the vast majority of Chinese citizens are not anti-government activists, any such survey will be dominated by those who can finally get a line of credit for their small business. Even a million Uyghurs in internment camps don't make a dent when you're just looking at average satisfaction.
People in cults also say they’re doing fine...