Sorry but this is mostly right. most stories surrounding Legion in the comics tend to be darker, complicated and usually leading to many tragedies. that is why he is called an antihero. The overall character of Legion is not rosy. Please factually see many main legion story arcs from
Legion Quest that lead to Age of Apocalypse
New Mutants 90s
Age of X
Sins of the Fathers X-MEN Legacy
Also, Marvel once felt Legion was too much of an extreme character and too complicated to be in the comics but the Great Chris Claremont who created the character found a way to work around that.That quote you posted is a one tiny section of Legion history, I am talking the overall character in story. Also here is bonus for tone, both animated adaption that was Legion centered, in X-MEN Anime and X-MEN Evolution got the same darker tone of the FX TV series.
things can be spinned but one this remains the same. Legion has never been a light hearted character where the tone of marvel films or the sitcom thin story style of Wandavision TV series would have been fully justified.
Neither Thor RAGANORK and the GOTG original concept in the comics have a comedy tone.It makes Guardians Of The Galaxy or Thor: Ragnarok look like the "Sin City..." films when it comes to being faithful to the tone of the actual source material.