There's a substantial difference between sleeping at work because you work 17-hour days, and taking a quick nap in the middle of an otherwise normal work day as a simple way to 'reset' between morning and afternoon.
That's not what they're talking about in the article, though:
> [About China:] Workers caught in the throes of a 12-hour (or more) work cycle are encouraged to take a daily midday rest, which typically lasts no more than 30 minutes
> ...
> Workers who fall asleep on the job or are tired to the point of incompetence are losing significant amounts of money for their employers and the broader economy
I.e. naps help you drive your workers even harder.
Near term, at least. Unionizing might reach more dramatic results, but that's a many decades endeavor, and doesn't help people today. Short term relief has value.