I believe that what KZ8 means for his inverted aircraft is that when inverted:
The wing is now "lifting" UP wrt Earth and DOWN wrt the pilot
On an upright aircraft, a wing lifting UP wrt Earth (and pilot!) usually causes a nose down pitching moment (again wrt Earth and pilot).
Therefore on the inverted aircraft, the pitching moment is (still) nose UP wrt Earth, but nose DOWN as viewed by the pilot.
Similarly, an upright aircraft would have a tail download for trim (wrt earth and pilot)
So the inverted aircraft has (still) and earth-reference tail download, but a pilot reference tail UPLOAD.
The aircraft will obviously be at a significant negative AoA to generate the pilot-reference "down-lift" and the stick will be forward to generate the tail load for trim.
It's no different to an "upright" aircraft bunting to -1'g' in concept - negative AoA, stick forward.