European Commission spokesperson Adriana Podesta gave us the following response via email:
"As you've correctly pointed out, Mr Cardoso works in the Director General for the Internal Market and not in the Directorate General for Competition.
"Mr Cardoso is not involved in the assessment of this transaction. Furthermore, as indicated clearly in his Twitter profile, he tweets in a personal capacity."
European Commission Responds to Perceived Bias in Microsoft-Activision Merger | TweakTown