This represents a confusion. The cyclotron is a type of particle accelerator which, in the form of the Calutron was used to separate U235, as described. The centrifuge is more closely related to the gas diffusion technique implemented on a massive scale at Oak Ridge.
OPINION:
Thanks Dr. Lew for your feedback.
Yes, I was reading about the history of the particle accelerator of early times.
I see where the confusion comes in.
His statement was most likely a broad generalization for the general public.
Got it.
Speaking of Oak Ridge...now that place sounds familiar:
http://www.freerepublic.com/tag/oakridge/index?tab=articles