That's an unnecessary quip as that's not the point of checks.
It's not surprising that if unemployed people receive benefits with no strings attached their "mental health" is better since it removes pressure to find a job.
> It was the unconditionality itself—the simple act of trusting people with resources, without surveillance or judgment, without hoops to jump through or forms to fill out—that created these dramatic improvements in psychological well-being.
It not about trusting people with the money they are given.
The usual checks are because people are expected to earn a living by themselves and unemployment benefits are only meant to help them while they can't and are looking for a job. It is not meant to enable a life-style, which is what unconditionality can lead to.
> the conditions we attach to welfare aren’t just bureaucratic inconveniences. They are active harms. They create stress, anxiety, and psychological damage that persists even when the financial support is adequate.
Oh dear... This reads like a parody at that point.
An useful measurement would be to see which group, if any, found a job quicker. A finding that conditionality does not speed things up would be noteworthy and helpful, a finding that people feel better when they get money every month unconditionally isn't.