Yes, China have a good shot at doing it because they are building 33 simultaneously now and they have questionable workers rights and environmental policies.

As I said, if a developed country can do half what they’re doing (ie twice the price and double the construction time) in the next 20 years it would be a miracle.

It's not really a fair comparison though, is it? Is a questionable environmental policy worse than a bad electric grid? America has a dirty grid that has fairly limited capacity. How many fossil fuels will we burn (producing electricity, and powering non-EVs) because we aren't building nuclear? The environmental benefits of having nuclear power probably largely make up the difference (if they don't exceed it), and that's over the time scale of a century or more where we'll need to catch up.

Workers rights I have no real knowledge on. But China isn't known for their track record on any kind of rights, and arguably US blue collar workers have a pretty awful quality of life that the government largely doesn't take the blame for (because we don't have state-run healthcare and minimum wage doesn't keep up with the cost of living). China has forced labor, America has legalized slavery in the prison system. Plenty of American industries rely on the unethical use of migrant labor while the state disappears those same people to "alligator alcatraz" or overseas prisons. I don't know the full extent of how bad things are in China for the kinds of workers who build these plants but I am hesitant to overlook how bad things are in the US.

It's also a country that doesn't seem to care if the project is not cost-effective from the PoV of western companies. This is always a salient point missing from most conversation about the US and by extension the Western world; the advocacy of cheap energy are hiding the argument that nuclear power is both more consistent in power delivery and cleaner (arguable with the nuclear waste ofc) than any alternative currently available.

There was a recent study from Chain where they assess their own 4th generation Nuclear Reactor programme as being at least 10 - 15 years ahead of the west, and specifically said even that number is conservative estimate.

I wouldn't be surprised if they accelerate their time line and building target.