To me, it stands out like a sore thumb that they've demo'ed it with just 2 channels (as opposed to a number just ever so slightly closer to "infinity", for example 3). Using polarization to provide 2:1 frequency reuse is as old as the hills. So they've demo'ed exactly nothing.
There's an old concept about layering differential circular polarization on top of H/V linear systems (and vice versa), but it was anticipated to be a very narrow increase in the total bandwidth.
I'm not a radio wave guy but this sounds like a pipe dream to me.
I recently came across a patent that my father got for what he called "Vibra-Spray", a way of creating turbulence in water droplets coming out of a spray nozzle with the idea that this "vibrating" water was going to clean better (he made industrial washing machines for things like animal cages). I remember welding the little twists of sheet metal into the pipes feeding the nozzles and asking him once how this was going to do anything once the water came through the nozzle. He said "It doesn't, and it doesn't need to. All it needs to do is be there so that we can say it is".
"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
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