Steampunk influences in "Chitty Chitty Bang Bang"

http://thepandorasociety.com/steampunk-movie-top-ten-8-7/

Thematically Chitty Chitty Bang Bang follows a path common to many “Steampunk” stories, that of technology meant for the betterment of humankind being perverted by tyrants seeking power, and how the rebellious spirit of the free-thinker can defeat imperialism . . . is it a coincidence that the purple, green, and white of the floating Chitty are the colors of the women’s suffrage movement of that era?

Steam Punk: The movie has a steampunk sensibility, but Chitty is a 20th century gasoline-powered vehicle, and the mood is the very opposite of "punk". The novel is set in the 1960s and is definitely not steampunk. (Diesel Punk, then?)

So why is this relevant, you might be asking. Which is where my confusion comes in in the first place--why aren't you already convinced? The mad inventor, the trappings of Victorian times, the pulling-up-from-your-bootstraps mentality, the Rube Goldberg Breakfast device in the kitchen, the Vulgarian zeppelin--I mean, it's all there! Follow the Steampunk 101 list and really, it's almost textbook. All it lacks is something powered by steam alone, and something made from cavorite floating to the sky!

It's perfect. Hells, it even lines up to Edward Pearse's claim that there's a brighter steampunk world, to balance all the rust and shadow! Edward, this is your film! A brighter, happier steampunk vision was never recorded. Hells, even the hints of danger and child endangerment sound fun.

So why isn't this listed with so-called "traditional" steampunk fare? Go 'head, hit me with your answers, I'm curious.

Chitty Chitty Bang Bang (1968) – based on a novel by Bond scribe Ian Fleming – features a flying car which was the epitome of retrofitted early-1900s technology and cemented a certain vision of the Edwardian era and its imaginary hijinks.