I spoke all of the examples at the beginning of the article, and I don't sound like any of the "new" examples; furthermore my mother was from the U.S., so I should sound more like them if anything.

I've also lived on both coasts(as well as nearer the center), and honestly I don't remember anyone speaking like this.

I've never actually heard "aboot" either.

I don't actually see any references, so I'm not sure what "linguists" they're talking to.