When I refer to a machine I have in mind Behe's definition of an irreducibly complex system consisting of many well-matched parts.
If you're referring to "molecular machines", I don't see how the molecules in the flagellum could be any better "matched" than any other chemical interaction.
Honestly I see this as just equivocation on the term "machine". Machines are traditionally referred to as artifacts created by humans to serve some specific utility. Since the flagellum wasn't designed by humans or any other entity we know of (if it was designed at all), how can it be labeled a "machine"?
Are machines the only things in your view that can do anything?
I can't prove molecular machines were designed. ...And evolution is an expression of this technology, not some side-effect.
Again, this just appears to be equivocation on the word "machine".