"Directly at odds with the KIPP administrators who have years of data and research to back up their work."
As of a year ago when Paul Tough's book came out all they had were standardized test scores. Not sure if there is any new research, but as far as I've seen there are no studies on longterm outcomes yet.
"How else do would they acquire the relevant data without actually implementing the schools?"
Ignoring the fact that the KIPP methodology is at odds with established research on what leads to good outcomes, I'd say that we should implement the schools. But we shouldn't force all schools to adopt this system until we know they work. It's not the schools that are a scam, it's the movement to spread the system throughout the country without properly validating it first.