We don't have any standard singles sanctioned event data on courses with SSAs over 71 or so. So we can't confirm how well the system works above 71. No reason to believe it doesn't work. There's just no data. The last 2 USDGC events included other format elements so those scores can't be used as part of any validation data for just standard singles on higher SSA courses.
Rater of the tossed arc.