What is the Locked Rotor Code? And the length of the branch circuit?
If the nameplate rating is 182A, that already exceeds the Table 430.150 value for 150hp motors. That surprises me a bit since the Table is based on the absolute worst motor any NEMA manufacture makes.
In any case, the manufacturer may be concerned about motor starting voltage drop as part of their recommendation.
BTW, 75C terminals are standard for NEMA Design B,C and D motors. Design B is pretty much the "garden variety."
Robert B. Alexander, P.E.
Answers based on 2014 NEC unless otherwise noted.