I just looked at the R&T Guide, and here's the quote I found concerning the fuel cut:
"To make first to second gearshifts of the electronically controlled automatic transmission buttery smooth, fuel delivery is momentarily cut to three of the cylinders as a torque abatement method."
See, there's no claim of shutting down a 'bank' of cylinders - it just cuts fuel to whichever three cylinders it needs to in order to make the first shift smooth.
I'll buy that - the 1-2 shift on my SVX has always been quicker than the 2-3 or 3-4.
But I see no mention of displacement on demand.
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