Joshua Topolsky has made a living out of breathlessly writing about tech trends that he and his teams don't understand, so this is really just the latest straw on that poor camel's back:
In case you didn't follow the original post days before Topolsky stumbled upon it, a designer decries a certain type of icon, claiming (without any evidence or citations) that they cause more work for the human eye, and are therefore bad design.
(Yes, of course that same author posts the exact kind of work he's decrying on his own Dribbble page. Would you expect any less?)