I'm sorry, but this is simply not correct. There have been some attempts to show that the flagellum is not irreducibly complex; they are not convincing arguments.
The arguments that irreducible complexity doesn't exist at all are even weaker. As I mentioned in another post, irreducible complexity is a physical reality in many mathematical, physical, chemical, engineering, etc. systems. To maintain that biological systems are the only systems where it doesn't exist is an unwarranted assumption.
The flagellum: nature's prime number.