Besides the French, you are please to notice that he is not singing in his countertenor voice.
From the comments associated with YouTube films of Jaroussky I gather that there is a controversy concerning him. He has two entirely unrelated personae as a singer--the French pop singer seen above, his natural voice, and his classical falsetto countertenor. By now he is famous internationally for his classical work.
The technical production of these two vocal styles is completely different. In his natural voice he croons with very little force behind the tone. This type of singing usually requires a microphone which you see in the film. A countertenor's falsetto is a very penetrating sound that generally does not require a microphone. The way the tone is produced makes an enormous difference.