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please take another look at the docs

Centroids are accessed via centroids(label, 0) for x and centroids(label, 1) for y. The data type CV_64F.

so, it's not a Mat of Point2d, but a 2xN Mat, and you'll have to access it like:

double x =<double>(i, 0);
double y =<double>(i, 1);