It would be interesting to see more detail. Are they putting a notch filter in between the long and mid wavelength comes or are they doing different filters on each eye to allow the user to see green with one eye and red with the other?
Yes, they are using a technology that letsbthem build a die to create any sort of custom filter. So as you mentioned in your post, they are creating a notch in the spectrum where red and green response in the eye overlaps the most. They have a good video on this on their Youtube channel.