Would be curious to see a build video, routing hoses through that must be an adventure. Impossible to change the stem without de-cabling everything, btw, so you can't buy 2-3 stems and casually swap them for bike fit.
I also really doubt you can run mechanical shifting + hydro hoses in there.
I'm no engineer, but a stem is big, so it can be thin + strong. This system replaces the stem with 2 narrow tubes, so they need to be thicker.
I wonder about build quality, weight, ease of use, ride quality.
Kudos for innovating though.