Proper token award this one, means nothing in terms of goalkeepers really.
You defend and concede goals as a team. It starts at the front with your strikers and midfielders and whether they give the ball away or press to win the ball back. Then includes the back four and defensive mid being in position, winning tackles/headers/interceptions and not making mistakes. Then it even relies on the quality of the opposition players getting crosses, passes and shooting accuracy right before the goalkeeper even comes into it.
A goalkeeper can make no saves all game and still keep a clean sheet.
If anything the award should go to the goalkeeper who makes the most saves in a season. Maybe a ratio of saves to shots at him. Maybe include a ratio of crosses come for and won, passing accuracy etc. too. But giving one man a team award that he only fits on the end of if all the rest of the team haven't done their job first doesn't really fit.
Plus football is about scoring goals and winning games. It's far more impressive to score 100 goals and concede 25 than it is to score 85 goals and concede 5, yet there is not end of season team Golden Boot award.