Correct, although it can be said more simply. "Max motoring" is the maximum motoring speed you can achieve with the starter from the air source being used.
In general, you are given a target minimum motoring speed at which fuel should be introduced in order to avoid compressor stall, lack of acceleration, and high EGT. If your air source can't motor the engine to that normal minimum speed for fuel on, then introduce fuel when the engine has accelerated to the (lower) maximum motoring speed. You may not get a successful start in that case. From what's written above for the 737/CFM56, Boeing doesn't want a start attempted if max motoring is below 20% N2.
Also, what the heck is an "IDG fuel spar valve?" I know of no such thing on any Boeing model.