The PFD order symbol is completely irrelevant for the flight control check and should not be checked. The only screen that's relevant is the flight control SD page.
Completely correct, PFD has the input, the SD the output. What you want to check is the output of the input after it goes via the computers and the controllers and hydraulics, i.e. the SD.
Same is done for a rigging check, check the upper/lower ECAM.
I am familiar with 15 different airline procedures including Airbus and I have trained at least 12 of them and none of them follow this silent procedure.
Airbus these days is half/half from what I understand, the PNF calls the SD display when the PF does the FLT CTL check, and silent when the PNF does their unless it is not normal.
This is to keep the PF heads up while taxing.