Pelicot himself admitted to what he had done, drugging his wife and inviting/recruiting men to rape her. Some of the men have also admitted to being rapists. A Court heard all the evidence and found them guilty. What more do you want?
One link to a news report ...
https://www.aljazeera.com/news/2024/9/17/i-am-a-rapist-french-man-admits-to-drugging-and-mass-rape-of-his-ex-wife
There are many others.