I think that's an old trick that would have been necessary to ensure the automatic choke would kick in. It was necessary in the days before engine management systems were standard fitments
I think your Golf will have a proper engine management computer that will take care of the mixture and the idle speed, so there shouldn't need to be a different procedure.
I remember an old Honda Accord where a stab of the pedal was needed on starting from cold.
God be with the days of my old Mini and Metro & the manual choke. Old Fiats and Alfas also had a bizarre 'hand throttle' in addition to the choke that you were supposed to use in cold weather - I think it maintained the idle speed higher without affecting the mixture - if the thing started at all... ours didn't (much).