I don't know if it's the name or the description that's the problem here. Maybe both.
The title "Defector From Decadence" implies someone who gives up a life of wealth, leisure, high social status, etc. You know, decadence.
The page description, however, makes this about anyone who gives up their old allies because they don't like them anymore: "A character who joins either the protagonists or antagonists not so much because he agrees with all their ideas as he can no longer tolerate the opinions or actions of his old group."
That's just plain old being a defectoródecadence has nothing to do with it. Theoretically, a broke guy getting annoyed with his broke friends and going to hang out with rich people instead would be a "Defector From Decadence" under this description.
So, either the name needs to be changed to fit the description, or the other way around. Perhaps the best option is to make two separate tropes, one for the general case of getting fed up with your old group, and a subtrope specifically for getting fed up with your life of leisure?