re: Zosia grass and bent greens is what led to those low scores at the PGA

No, plenty of difficult courses with zoysia and bentgrass. Most of the greens up north are bent grass.

The low scores were because the course was easy. No contouring on or around the greens. Hazards 40-50 yards into the rough that were hardly in play. Bunkers cut to grade making them very easy to play out of. If you have big greens and flat areas around them, pros are going to destroy a place no matter how long you try to make the golf course.

Look at Xander's last two holes. Iffy drives that he was able to hit easy bail out shots to large flat areas with simple up and downs (made them look simple even with the pressure of winning a major).

If pros can do that, then take dead aim when they are in position, they aren't going to make very many bogeys