All the example table images seem fine, and have no captions saying whether they're supposed to be examples of good usage or bad usage.
So either I have no idea what "bad" examples of icon usage are because the author doesn't show any, or the author thinks some or all of them are bad when, to me, the icon+text+color examples seem great (and one figure caption indicates icons+labels are best)?
Yet the author continues to argue against icons and to use text instead? But never says whether icons+labels are actually better than just text, so we should use them in combination?
I'm baffled. For an article arguing for greater clarity, the article itself couldn't be less clear.