Colourblindness knows many types, most can still see color.

At least on paper it seems plausible to measure the cones per iris and then build a filter to strengthen color that is lacking.

The moment i realized they sold them without detailed personal eye scanning involved i knew they were a scam. Gimmick at best. Worst part is they seem catered to people as gifts for colorblind friends, thats just a way to obstruct people from analyzing them to much. What are they going to say? “I dont for a sec believe this overly saturated view is realistic and your gift sucks”? No the will say “wauw thank you” and shove it in a drawer somewhere next day, never to mention them again.