No, not at all, and I think it’s really easy to spot the difference between “this is me telling you about myself” and “this is me reaching for otherness to set myself apart.”
When you tell somebody your grandmother was Lumbee, that’s plain and to the point. When someone is like “well I think my grandma was part Indian” I’m already deaf to that because you don’t even know. And it has no bearing on your heritage or upbringing whatsoever since you clearly aren’t sure A) where she came from or B) if she was even Native American to begin with. It’s just always black folks claiming some white in their family or some Native American in their family because they have “good” hair or some other trivial nonsense.
Look at this way…ain’t nobody ever tried to say “well I think my Grandma might’ve been part black.”