I calculate that for a woman of median height of 5'4" (1.63 m), a BMI of 29 corresponds to 277 lbs (126 Kg)
I think your calculator is off. At 5' 4" the BMI for a 175 lb. person is 30 and 210 lb. generates a 36, which is the cutoff point recommended in the article.
Actually, based on that height and weight, the BMI would be 47.5.
For a 5'4" woman to have a BMI of 29, she would weigh approximately 170 lbs. Which is a huge difference!
"I calculate that for a woman of median height of 5'4" (1.63 m), a BMI of 29 corresponds to 277 lbs (126 Kg)"
You should use this calculator then:
http://www.nhlbisupport.com/bmi/bmicalc.htm
The BMI for the woman you describe would be 47.5.
A 5'4" person with a BMI of 29 would weigh in at 169 lbs.
What is odd is that BMI dictates that men and women have the same build and that fat and muscle mass are equally bad.