G-550, we were test flying the LOC (or possibly a VOR APP) years ago in the sim and could never meet our stabilized approach criteria. With full flaps and gear, airspeed increased 25-30 Kts above Vref going downhill and unspooled. Doesn’t look like the GPS - F is any different re the G/S angle. Can’t imagine the 320 at Vref, 140, could meet any stabilized approach criteria.