I think it's just the opposite as this game is important to McC for a variety of reasons.
He's coming off a game most think he was lucky to win and the rap on this team in the past has been it folds against the better teams, also the rap on the QB.
His team is considered the contender in the East but not the NFC, he's playing one of those teams Sunday.
Most of all, he needs this game for his team's confidence. The secondary is banged up, OL is missing pieces and incomplete and his pass rush isn't. Wouldn't you agree he has adversity? Wouldn't you also agree that the SEA coaching staff is considered superior to the Cowboys'?
Adversity and not being at full strength is exactly how Pederson has won over his team. That's how he won a ring, pure confidence built through the confidence his players have in their coaching staff to equalize the games while missing some key players.
McC has been second guessed in both games by the media and this forum, think his players are immune to that? Think they don't wonder if the game is on the line, is their HC as good a decision maker as the other team's? Hell, I think that's what gives Belichick his edge before the game starts, they know the Mad Scientist is across the field, planning and plotting.
McC also realizes that the strength of his team, offense, matches up very well against SEA, who's D consists of 3 good players. This is the type of game he is expected to win, This is the type game he was hired to win. McC goes up against a team with a good pass rush and/or secondary, he gets a little slack but he should win this game because his offense is just as good, if not better and this game is all about the O.