Guru on Canal Plus: what is the psychological thriller with Pierre Niney worth? (critical)

This thriller about influence and speech is less about what it says than what it shows. But can we film the speech without being a prisoner of it?

A few months after its success in theaters (more than 2 million spectators in France), Gourou is broadcast for the first time this Friday evening on Canal Plus (and visible in streaming on MyCanal). This is the third collaboration between Pierre Niney and director Yann Gozlan, after An Ideal Man and Boite Noire. Here is the review of Première published when it was released in cinemas:

Everything is in place from the first scene. An overheating body, a man facing the crowd, a speech that promises everything – absolutely everything. From this (operatic) opening, Guru does not deploy: it engages. The rest will be a spiral: Yann Gozlan does not tell the story of the rise of a coach (played by Pierre Niney) but orchestrates his descent into hell, as if the film, having laid down all its cards from the start, only had to observe the consequences…