The article actually mentions Bernard Loiseau, not Benoit Violier. Loiseau took his life after hearing rumors his restaurant would be demoted from three to two Michelin stars.

There was a book written about the Loiseau event (reads like it was supposed to be a biography at first, of which the suicide obviously overtook the narrative): The Perfectionist: Life and Death in Haute Cuisine [0].

[0] https://www.amazon.com/Perfectionist-Life-Death-Haute-Cuisin...