22,000uF seems pretty small for the capacitance of a flagship amplifier, and wasn't the Audioholics review commenting on the weakness of the Pioneer SC ICEpower amp having only 20,000uF?
Even the old mid-end Onkyo TX-SR805 had 30,000uF.
According to Audioholics competing receivers like the Z-11 has 54,000uF and the Denon 5308 has 66,000uF.