That's because he was stopping. There's no rule that says you can't stop at the puck, or even "stop it in." The only thing the rule says is what we all know about a "distinct kicking motion." To me, that involves movement from the knee, or your foot moving at a different rate than the rest of you, not just repositioning your foot.
You obviously don't watch enough hockey to know the difference between kicking and redirecting the puck.
He clearly tried to kick the puck back up to his stick and missed his stick. The Penguins hate on this board is hilarious, I don't see how that play could be taken as anything but a distinct kicking motion.
So, you say he was trying to kick it to his stick? But it missed? So he wasn't trying to kick it into the net?
So the puck accidentally REDIRECTED OFF HIS FOOT INTO THE NET?! OH. EM. GEE.