I can imagine two different meanings for “not convinced about MWI”
It refers to someone who is not convinced that MWI is as good as any other model of reality, and better than most.
It refers to someone who is not convinced that MWI describes the structure of reality.
If we are meant to understand the meaning as #1, then it may well indicate that someone is stupid. Though, more charitably, it might more likely indicate that he is ignorant.
If we are meant to understand the meaning as #2, then I think that it indicates someone who is not entrapped by the Mind Projection Fallacy.
I can imagine two different meanings for “not convinced about MWI”
It refers to someone who is not convinced that MWI is as good as any other model of reality, and better than most.
It refers to someone who is not convinced that MWI describes the structure of reality.
If we are meant to understand the meaning as #1, then it may well indicate that someone is stupid. Though, more charitably, it might more likely indicate that he is ignorant.
If we are meant to understand the meaning as #2, then I think that it indicates someone who is not entrapped by the Mind Projection Fallacy.