I don't know about that; body chemistries are very different. But more importantly, it sounds like you live in a place with reasonably cool, dry air. Some of us don't have that privilege.
It's good advice, don't get me wrong. I myself lead a largely carless life in -- of all places, rather improbably -- downtown Atlanta, and walk about a mile and a half to work each way, and pretty much walk everywhere else too.
But to think I could bike around here without getting sweaty is a practical impossibility, no matter what condition of fitness or body weight. It's extremely humid, though not quite as bad as the gulf coast. It's just not going to happen. So, I'd suggest for anyone in that set of circumstances to be pragmatic and bring a change of clothes and try to find a place where you can shower at work.
I agree with the body chemistry bit, though. Some people just can't do it, one way or another. But for the majority of people, it's just an excuse. And it's a convenient one because they frequently are already unhealthy or overweight.
That can be a quite challenge most months out of the year, and I'm in fairly good shape. But I walk quite faster than most people (can't really help it). Even in the winter, I just feel cold from the chilly wind while simultaneously sweating inside my coat. It's the quintessential "clammy" experience. This area of the country absolutely sucks, climactically, although not quite as badly as Houston, where I lived for a while.