After VOR/LOC and G/S are both captured, the APP mode can be exited by:
• pushing a TO/GA switch
• disengaging A/P and turning off both F/D switches
• retuning a VHF NAV receiver.
How then does he expect you to engage LvL chg at 1000' if loc and gs are captured.
Just do what boeing says and let him mark you down for it. This will make him look Silly. Not you. Btw i would adopt the procedure he is advocating if I discontinue the approach from higher up but at 1000' you are already established. Stick to the basics. Hit TOGA first and then lvl chg when appropriate (which maybe very shortly after)