It would be great if this were true... but I doubt it. I've never heard any indication that Apple's scheduler has much in common with any of the FreeBSD schedulers -- my recollection is that their scheduler comes from the Mach side of things. They might borrow a few ideas here and there, but schedulers generally tend to be pretty tied to their parent kernels, so I'd be surprised if any ULE code migrated to OS X verbatim.
File this one under "cool story, too bad it's not true".
File this one under "cool story, too bad it's not true".