but when installed remote as described wouldn't the supply require an additional disconnecting means
How remote is remote?
The disconnecting means shall be installed either inside or outside of the building or structure served or where the conductors pass through the building or structure. The disconnecting means shall be at a readily accessible location nearest the point of entrance of the conductors. For the purposes of this section, the requirements in 230.6 shall be permitted to be utilized.
IMO, If the generators built in disconnect is readily accessible and located next to the building it serves 225.32 has been satisfied.
IMO it is up to the inspector to determine how far from the building the disconnect can be located. This to me is no different than 230.70(A)(1) for services.
"nearest the point of entrance"
Is always open to interpretation, at least that is how it goes in the area I work.