Doesn't work. You don't have full control over every color all the time and you're going to make assumptions. That's kinda the point.

they explicitly had an opinion about true color, right in the article we’re discussing

The entire point is to not use true colour but rather a user-configurable theme, but with 256 colours.

We're probably close enough to a future with the technology and engineering able to implement it, to justify designing 48-bit perceptual bit depth standards. Optimistically presuming breakthroughs enabling in vivo biological upgrades to our eyes to match those of mantis shrip, we could design 160-bit standards knowing that is a "proven" biological technology capability. That gets within the same galactic supercluster of the known limits of physics limits.

At the currently known limits of physics where Heisenberg Uncertainty Principle, Abbe's Limit, Quantum Shot Noise and such become our sensing barriers, we suspect we need only about 6000 bits per pixel to represent a digital twin of the electromagnetic field of the sensor-covered volume of space. At 60 fps, that is 1.8 Zettabits per second. Scale out data volume accordingly when using using 18.5 sexdecillion fps (Planck time fps).

What surprises me is these "limits of the fabric of reality as we know it" mind experiments fairly concretely point the way on the many roads towards Kardashev Scale implementations, and is not that different from Archimedes' "Sand Reckoner" and Hindu cosmological Kalpa time scales. History doesn't quite repeat, but rhymes yet again.