I find nothing on Mauna Kea on his site, so I would suspect that he did little to no bunkering, routing changes, green contour work.
That seems to be a let-down for the resort. It's not like people say "I'm going to MK because it's RTJSR in the purest state" or "Hey, it has seaside paspalum!" They might go if they saw that RTJJR had completed some in-the-spirit-of updates to the course.