As I understand the terminology, exoplanets are planets, so the headline is even technically correct. It's like if a headline said something about rectangles and you corrected it to squares.
I'm convinced that the reason for all the Chaos these days is because Eris was snubbed. The rules for what a planet is were changed purely to keep her out of the club. It seems even more egregious than the snub that led to the Trojan War.