So to clarify, PFC's automatically positioning the elevator and stabilizer is not auto trim?
During manual flight the PFCs do NOT move the stabilizer in turns.. They temporarily bias the elevators so you don't need back pressure in a turn.
If you hold constant back pressure on the column of a 777, does the aircraft trim that pressure out? If you are using manual thrust and let go of the controls, does it keep the current attitude, which would be the case for Auto trim, or return to it's original trim speed- which would be a speed trim.
It's a matter of definition, but what the 777 has is completely different to the auto trim on an Airbus.