As of a few years ago, my take is the bunker behind the green makes the hole goofy hard for a typical player. I'm looking at a photo of the back bunker and it's so big, quite deep and maybe 20 or more yards wide. Bunkers line about 75% of the green's perimeter.
The problem is that some professional golfers can drive the ball past the green, so I guess the club and the PGA don't want them having a relatively easy up and down from behind the green. For day to day play, the huge fronting bunker requires either of two strategies. You can play safe sideways and try to hit the front left of the green, which is doable, and then try to two putt to the back pin positions from there. I did that once and it was a very memorable down-in-three moment for me. The other option is to try and hit a soft bunker shot to the right half of the green, which slopes steeply away from the player and is only about 10 yards deep. At least 90% of the time you'll be in the back bunker for your next shot, which requires a tough but not impossible shot back onto the green where a challenging double bogey is within reach.
I don't think that back bunker was always there. The question is how could you make it tough during tournament week for the pros but not so difficult for day to day play? There has to be a better solution. You could cut the grass behind the green to fairway height all the way to the 11th fairway, and see if the pros can get up and down from 25-40 yards away. Or you could let the grass grow to 4-6" and let them struggle with that.
I still love the hole for the way the precise layup short of the left fairway bunker gives you a great angle, a straight-on look at the deep but narrow green. From there a front pin location is a pretty easy shot. It's not one of my favorite holes on the course, especially when watching the pros play the Genesis Open. Most of them try to drive the green and it seems at least half of them end up in the grove of trees left of the green where the resulting second shot varies quite a bit but it's not very interesting to watch.