While I can't speak to the specific circumstance being discussed here, there are a number of examples where the forward CG has been tweaked aft to adjust the stall speed down. The other speeds are predicated on, amongst other things, stall speed. Generally, if one can reduce stall speed then one can reduce the V speeds and, for a given (critical) runway length .. pick up some extra kilos.
The concern is not where you might be operating within the envelope on the day .. rather that the restricted forward limits (generally in the higher weight region) must be observed to take advantage of the benefit. Conceptually a bit like thrust derate ... have your cake and eat it sort of situation ..