The article made it sounds like a universal offer, maybe I could see per-business unit, but not per-employee. That would require you to already know who the dissatisfied workers are. The stated point was to discover early who is not satisfied in their job.
As others have mentioned: keep in mind this offer is for warehouse employees. There's lots of hard metrics being gathered on those employees, so it's straightforward to figure out which ones are underperforming.
Do you have a source on that?