That's false for the most part. Sure at times 4th gets matched against 4th, but really, have you seen how often that happens?
Firstly, both lines, by definition, get little ice time, usually six to 10 minutes a game. They don't meet up against each other all the time.
Secondly, Sutter has been one to not worry about match ups much, if at all, so while he might not throw a 4th line out against guys like Toews and Kane, he'll throw them out there when he feels he needs to the vast majority of the time. He's always been one to reward effort, so if Vey et al are playing well, they'll hit the ice regardless of who is out there.
Thirdly, the only time that any coach will really try and worry about matchups against the Kings 4th line is the opposition coach, when the Kings are on the road because they get last change and it's much easier to create match ups. And you don't usually try to exploit the other teams 4th line with your own 4th line.
And fourth, if Sutter is really worried about another teams 4th strength being so worrisome, for that game Vey would likely get scratched in favor of a dude like Carcillo anyways. Odds are if Vey is coming in, he's going to be expecting to get the odd scratch here and there, whether do to poor/inconsistent play or concerns over being physically outmatched.