The old AS 330 had the transmission oil pump on the LH accessory drive on the rear of the gearbox although the pickup was still at the bottom. Civilian use required a back up system on the 332 so they designed this Heath Robinson system placing both oil pumps dependent on one drive at the bottom of the gearbox.
In retrospect it would have been far better to have put the secondary oil pump on the RH accessory drive together with No 2 Alternator and No2 Hydraulic pump.
Doesn't help when you reduce the planet gears from five to four.