The tasters assumed the wine didn't have food coloring and correctly used all senses available to them to do the tasting. It's very disingenuous to point out that they should have used more white wine descriptors. The wine was red, so they used that information to further deduct characteristics of red wine.
I also find it peculiar that they don't mention the variety used for this study [1]. The color of the wine comes from how long skins are left with the must (skin contact) while making the wine. There are many wine varieties (white and red) that taste very similar. In some cases, you can have both a white and red coming from the exact same grapes (Pinor Noir, for example).
[1] I did Ctrl+F for "variety" on the study: https://web.archive.org/web/20070928231853/http://www.academ...