“Sous le soleil de Pialat” is still visible on Arte, here is the link

https://www.arte.tv/fr/videos/097511-000-A/sous-le-soleil-de-pialat/

It is also available in SVOD on the Arte website

https://boutique.arte.tv/detail/sous-le-soleil-de-pialat

Angry, unconventional, of a rare requirement in his art, Maurice Pialat is told to us by William Karel, who was his friend and his still photographer for almost 20 years. From this privileged relationship, his unpublished personal archives, testimonies of the most famous actors of French cinema, portrait of a huge filmmaker and a wounded man.