Let me expand on the intent of my penultimate paragraph which i admit isn't clear, probably due to watching tv at the same time...
IF the thrust had been determined to be at least what was commanded then there is nothing inherently wrong with the GO command, particularly if the MAN THR was noticed over 100kts.
I still feel had the Airbus SOP calls been followed it is likely that this would never have happened.
Further criticisms of the nuances and actions (as to whether he should have left it or not) in the role of the Training Captain I'll leave to those of you more qualified than I.