Capn Bloggs
"GPS Altitude...Display on MCDU"
"Refer to GPS Altitude..." to the extent that it can be used to maintain level flight.
"Crosscheck all speed indications..."
"Alternate sources may be used to evaluate the data (from the reliable ADR):
-GPS altitude
-GPS and IRS ground speeds, taking into account altitude and wind effects".
Full stop indeed.
Why did you not quote the full Airbus Procedure as what you quoted would be after the stabilization of the aircraft. You can twist anything to make a point!