I wonder why they bothered to put in that restriction. By the time it was written, the Compass planes were already purchased with a MTOW of 85,500.
That is a good question and I think I have an answer.
Compass -175LRs are about to be start the process of being converted to -175ARs.
The AR modification adds a bit more than 3,000 pounds to the MTOW and something to the MLW, I forget what.
They probably knew about this AR weight back when the ordered the airplanes.