workers will need to work for 30 hours a week, instead of the usual 40 to 70 hours,
It's right there in the first sentence. They acknowledge that people work more than 40 hours a week, and this program aims to experiment what happens if they only make people work 30 hours a week. Of course, if you usually work 60 hours a week, you're probably used to doing 10+ hour days, and you could easily complete the 30 hours of working in 3 days. 3 Days on and 4 days off would be a pretty nice schedule. I would probably go for this type of thing given the chance.