Based on everything I’ve seen about them, it’s not . . . totally a scam. What it seems to be is a micro swamp cooler, like maybe, one smallish rooms worth.
If a swamp cooler works with your climate, then, yeah, it would cool you a bit. Especially for the brief time you add ice to the unit. If your climate is humid, or the temps are high enough, nope, does nothing more than a multi-speed fan would.
But for the small coverage area, they seem quite expensive, so I’m leaning towards over-hyped rubbish, rather than scam.