Confused by the "... that is cheaper than tap water". Growing up on an island with desalination, that was our tap water!
Or surface water for areas with plentiful rain.
And I’d further hazard a guess that their cost analysis hasn’t scaled up or thought about distribution.
And their invention is pretty useless for people inland since then it requires the distribution that makes many of the other systems costly.
Basically the title is PR bunk is what I’m saying.
Even if you did build one of these devices outside your house, you'd still need to pressurize and plumb it into your house's water supply.
Simply producing water is but one step among many to make that water usable.