I’m not sure where there is a large demand for natural light amongst people who both can’t get it otherwise and are in a position to do something about it.
Every home I’ve had (including starter apartments and a basement bedroom) was well lit by natural light. Offices have been more problematic, but decision makers generally aren’t effected by it, almost universally having window offices. Factories (at least the few I’ve been at) are often heavily lit with natural light via skylights.
That being said, there is probably a market in the higher end office design market and possibly for basements, like in the I like to make stuff video.
I think the problem then is “how do I design around/with this product.” Designers and builders roughly know how to use existing lighting products. How do you utilize this artificial sunlight product in your lighting design. Those wall mounted led windows look cool, but I’d be super annoyed if my desk were facing them. The fresnel lens looks nice in that accent position, but if it got in people’s eyes or strained them it’s a problem.
Finally, the two examples you showed are using stock led panels. As others have said, you can get some interesting effects from them, but I strongly suspect you’ll end up in the “uncanny valley” with that sort of lightning- the spectrum and consistency just isn’t quite right, the light doesn’t feel “warm” enough in the infrared, etc.
Try it out- see if you can get a lighting setup you and others love. I suspect the product is restricted to the high end currently because it’s genuinely hard to get right in a way that doesn’t feel cheap or artificial. But I’d love to be proven wrong.