No, that was just a committee in France that decided that. I can't mind on whether it went to court or it was destroyed only on their say-so.
The programme establishes the evidence and then an expert is asked to give an opinion on the authenticity. For some painters there are recognised authorities and their word is final.
The Chagall destruction was extreme to put it mildly. Even copies may be worth thousands so I'd be a wee bit dis-chuffed if that had happened to one of mines.