Sorry, Rich, just realized the article might have been a bit too linguistic for the general public...
I've been to various small towns / pueblos in Rio Negro, Neuquén, Mendoza, San Juan, Jujuy, Salta, Cordoba, Misiones to name a few, and while they might not be officially considered different dialects, you can detect many differences in the pronunciations, certainly intonations and the manner of speaking ( polite vs casual vernacular and a use of slang / idiomatic expressions ). Especially when it comes to the natives not distinguishing between N / M, LL/Y, B/V etc...So a person who has a knowledge of phonetics and speaks a few languages, would pick it up right away...Uruguay's dialect on the other hand is very much Rioplatense sound wise, but they take all the fun out of it by making it completely flat intonations wise ( kinda similar to native Canadian English hehe ). I'd still take it over the ridiculous Colombian one as easy as it is to understand or a boring pathetic Chilean...Not to mention Mexican, yak...