He is right in the sense that you need a bunch of different things, and you can't just base it on who scored the most (although it would probably improve their odds) but skill is still the most important thing. Or maybe most important in combination with the right work ethic.
Pretty much all the good 3rd and 4th liners were skilled players that did what they had to do to have success in the NHL. Look at guys like Stoll and Willie Mitchell. Stoll scored 100 points in his post draft year, and 68 points in his second year in the NHL. Mitchell was a ppg guy in college, who said Lemaire told him "your big, fast, have skill, play defense first and you'll have a long career otherwise you'll be out of the NHL".
You don't draft guys to be 3rd liners. You draft guys who are good hockey players and motivated and then its up to your development to get what you need out of them.