Or you could assume the "master" means something in the sense of "has mastered the craft of scrum". It doesn't need to say anything about everyone else, it just describes the hat that person is wearing (namely, one of expertise in a given field). The toxic thing here is your insistence on fabricating a demon where there is none.
I'm saying this is likely what the title was conceptualised to mean. In practice it doesn't mean that at all, but that's not germane in this particular context I think :)
