Because he can I suppose. It would be easier to chuck some drop bars on an F29
Cannondale used to make a cross frame with their 1.5" headtube standard. It came with a short travel version of the headshok fork.
I suspect if cannondale had anything officially to do with the abomination above they would have just custom fabbed a superx frame with their headtube on it and used the short travel forks they already make for their Quick bikes.