I am not saying that. I am saying that you cannot calibrate gamma in any consistent way with plasma TVs because of the ABL. And I'm also saying that since the white point changes as there is more or less ABL, you really need to sample the entire luminance range the TV will manage (or close to it) so you at least set some reference points correctly as you do the calibration.
No, that's not right either. I am saying because the peak white level changes as you have more or less ABL your gamma will change so you need to have some ABL (but not all of it because that would limit your ability to correct the brightest parts of a low APL image).
Image composition changes constantly. You want your calibration to not be locked-in to any one ABL level (or to a zero ABL level) because you won't see that when you view movies or TV, you will see the ABL changing the peak white level constantly. as APL changes. So eliminating ABL completely from calibration will lock you in to having a single APL or a small range of APL calibrated accurately. I'm advocating that it would be a better move to incorporate a wider range of ABL in the calibration because you are going to be viewing the full range of ABL when you watch movies or TV.
Any method of calibration that keeps some of the ABL action in the mix would be preferrable to calibrating a single APL value (that means you only know 1 APL value will have the correct gamma and you would have to trust the engineers to have perfectly accurate gamma tracking for other values of ABL that happen as APL varies while you are viewing content.