Rebel calm is a good phrase, and it carries the whole pitch of Albert Ramos’s book: composure as a form of resistance rather than compliance. Personal development writing lives on phrases like that one, and this title has picked a memorable flag to plant.
Beyond the audiobook we hold nothing about this author that could fairly be called verified, so nothing is what we will assert. The catalogue gives us the genre and the shape of the thing, and that is enough to know who it is aimed at: readers weary of being told to hustle.