"Simply devise a way to test for information predicated on trichromacy using bichromatic metamers." lol... "Simply..." this is literally the 'the explanatory gap' described in the article. We don't currently have a way to measure if the brain "acquired new information" when it knows about something but then sees it for the first time... which is the whole point. "experience a functional difference" -- what does that even mean?
AFAIK, we have no way of assessing whether “someone” has acquired new information other than that someone demonstrating their knowledge. We can’t MRI “acquisition of information”. So, as per this thought experiment, we have no way of telling if Mary gained new information by “seeing” red when she already “knew” what red was and could interpret it as such. That’s the whole point of the the thought experiment, which clearly went over your head.
