Some of the problems with this system are:

It is limited to photopolymers where polymerization is inhibited by oxygen.
Build speed is limited to photopolymers that don't cure to quickly (do to the exothermic heat produced) or the oxygen permeable barrier will melt.
Limited to smaller XY build areas unless you have a seamless projection system with multiple projectors or steering.

@SouthPaw The oxygen permeates through the bottom of the vat. It's not a complicated system. There are no ultrasonics involved.

Look for oxygen permeable polymer films used in food packaging or contact lenses. This system really isn't new. Let's see how their investors feel in a year or two after the system hits the market.