Agreed. I have a more or less exact idea of what they're doing just from the concept description as I design resin-type 3D printers at my day job. I know this concept has been tried, I think they're just the first ones to have gotten it to work.

The other thing to note is that this only works with a certain subset of polymerization reactions--not all polymerizations are oxygen inhibited so if they want to move into truly water-clear and UV stable materials this design won't work.