He gets airborne at about 45 seconds in to the video. I don't think there can be any doubt that it was an intentional act.
Whether or not he taxied intending to de-ice then changed his mind, or found that a de-icing rig was not available, or never had any intention to de-ice is irrelevant.
He took of with a contaminated aircraft, risking the lives of all on board. End of story.