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Hi, those are not "cascode miller capacitors", this is not an existing phrase. This is a rail to rail amplifier, everything is duplicated, not just the capacitors. But because it is rail to rail those also should be duplicated, so they can ensure stability at lower and higher output voltage swings too.
There are many class AB amplifiers with 1 compensation capacitor, not this is the point I think, but I am not sure.In a class A amplifier, there is only one device in the signal path (the complementary one is nothing more than constant current source).
In class AB, both n- and p-fets can be the amplifying devices in the signal path, so both are covered by the compensation loop. With only one cap, you would be able to see an oscillations if the signals would exceed some level.