This should read, "Spieth birdied the last hole to claim the win, while Dustin Johnson was only able to par." Spieth was "given" nothing. He played the same course and had the same shots as everyone else, including Dustin Johnson.
Spieth won the tournament by besting the field by one stroke. It wasn't "given" to him.
I had to read up on the course. I’m no golfer, but do live in the Seattle area. It looks like a cool course - obviously a lot different than what is usually shown on TV. It sounds like the folks wanted to make the players work and think hard. They got their wish.
Except insofar as Dustin gave it to him by missing that short putt for birdie. Such impressions cannot be erased.