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The "Why": 1) I must have a weak coffee (popej's post woke me up)prior to posting, 2) Missed the part that you said volume was at -40.
At -40 regardless of what you were listening to, the amplifier section likely was outputting very low level, so it is understandable that the measured "power" would roughly = power consumed by the video section and the other overheads (as mentioned by another poster earlier on) and therefore would look a flat fine.
My apology for my silly post that I have since deleted after popej's, to avoid confusing others.