Earlier quoted context omitted.
I had an overweight BMI when I could run a sub 3-hour marathon, I’ve concluded my body just doesn’t match the normal range.
Or BMI is a bullshit health metric. Ask any bodybuilder or powerlifter.
It's not A1C or something that's actively tracking your success and management in the long term, it's just the kind of thing where you look at it, look at the person, and say "is this a problem?" and usually it's clear.