The article mentions that there won't be any pay cuts, and that might be true for the current employees but for new employees the companies will just adjust (read: cut) pay to 32hr weeks.
I am also struggling to see how they plan on keeping track of this "no pay cut".
As with other wage and hour rules, if an employee thinks it has been violated they file a complaint with evidence, and the agency investigates. Since it's typical for pay stubs to report all the relevant information, proving that the pay per 32 hours after the law was not at least the pay for 40 hours before is...not that hard.
The labor market is a market, companies and workers need to come to an agreement on wages. And, right now, it seems that workers have the upper hand in negotiations.