The author of this article made a pretty serious mistake. The study did not confirm that fat is a "flavor," rather it found that fat is a "taste." Flavor is the combined effect of sensation from the taste buds in the mouth and olfactory nerves in the nose. Taste signals come from the taste buds only and are: salty, sweet, sour, bitter, umami and now allegedly "fatty."
Fat is a flavor? - Boing Boing