Gents,
Cook's 258 was recorded over a par 71 course approximating 7,100 yards. The 5th has been shortened from a 525 yards par-5 to a 480 yards par-4. Par is now 70 with the course playing around 7,250 yards.
Cook's performance was incredible, with the runner-up seven shots back - historically a winning score.
That said, I think it is reasonable to assume the course is at least one stroke more difficult given the speed and firmness at which the new Champion Bermuda greens can be maintained. Memphis is ill-suited for bentgrass putting surfaces which must be heavily watered or die in the heat and humidity. Champion is really a superior surface in this transition zone.
Interesting that there is some talk about moving the tournament to Nicklaus' Spring Creek Ranch, though a total absence of infrastructure there would argue otherwise. Architecturally, TPC Southwind is not a compelling golf course, but it has evolved into a very solid test for the tour.
Mike