I listened to the live stream before the "concert" began, and the radio talkers didn't speak French! They spoke English so the site must be fake since the majority of the French people don't understand english...so why would they speak english in a radiostation so that no one will understand what they are saying?
Lots of the major stations in Europe use English during certain broadcasts, because they are broadcast all over Europe, and English is the one language most Europeans have some knowledge of other than their native language. And to say the majority of French people don't understand English is totally false, I would in fact say it is the opposite. Now whether they want to speak it to you is another story.