Or to be more precise, the article claims that "experts" (meaning undergrads, ie above average but by no means expert tasters) can be deceived, and then acts as if that also means "Wine is a complicated elixir, full of subtle flavors only an expert can truly distinguish" is false. It's a complete non sequitur.
I agree with you 100% on the Coke versus Pepsi thing. Anyone who has spent much time drinking wine has wines they like better than other wines; there really are taste differences. (Note that I'm not saying more expensive is better; rather, that there are $15 wines I love, and $15 wines I don't like.)