Is he saying the confirmation should be by the PM or the thrust lever to be closed by the PM?
In my mob it goes something along the lines of:
PM (from the NNC): "Thrust lever (affected side)..confirm......idle"
PF: "Left thrust lever" (with hand on the left thrust lever)
PM: "Left confirmed"
PF: Closes left thrust lever
So, it is the PM that is actually confirming the correct thrust lever is being closed but the PF that is actually doing the closing.
If you just said:
PF: "left thrust lever....confirmed....closed" then I can see where your examiner is coming from because, for obvious reasons, it needs the other pilot to confirm the actions as opposed to the PF just saying "confirmed" and then doing them.