Aside from being about 1/80th the size of the US, and far less obese, their "scale" of obesity is far lower. I had a super-super morbidly obese teacher in college who took up an entire table, and had students do anything for her that required movement. This is relatively common in the US. Once you're at the weight a routine trip to the doctor could have you leaving in a body bag. It's incredibly misleading, and frankly a miracle our health care system can even keep most of these people alive as long as they do, let alone through pregnancy, which is effectively a surgery.

A Fatal Case of Super-super Obesity (BMI >80) in a Patient with a Necrotic Soft Tissue Infection https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5995720/