No! It's about the obesity of the heart! A very slim person may have a fatty heart and an overweight person may not have a fatty heart. In the study, all subjects had a BMI of 29. So they were all overweight! Nevertheless, only those who also had a fatty heart were bald. And the more fatty the heart was, the balder they were.
My thesis:
As soon as the body recognizes that the heart is becoming fatty, it uses DHT to send out messenger substances that make the hair fall out in order to cool the blood. There is already a similar consideration regarding the beard: A study was able to show that the body can cool better over a hair-free area and that the bald head is a compensation for the beard. However, this seems to be necessary only in men with fatty hearts.
Possibly, lecithin in extremely high doses (100 g/day) could degrease the entire body.
Lecithin is a mixture of inositol and choline. It's an emulsifier. Men lose a lot of choline through semen and that could explain the deficiency, which then leads to fatty heart disease.
Women who are insulin resistant also lose their scalp hair! And insulin resistance goes hand in hand with fatty heart disease! When the cells become fat, they can no longer receive insulin or IGF-1.
I'm not sure yet if fat-heart or insulin resistance is the cause or both.