I just downloaded the study. I was formerly a fan of the 1500hour rule, absent any other useful criteria or published study. Well here is the study and here are the results. You can't argue with the data. I will read the study more critically to make sure they are measuring what they say they are measuring.
This does seem to be an endorsement for University Training programs. I would agree. Those types of programs are highly structured and go far beyond the FAR basics. The 500 hour reduction to graduates of accredited aviation University's was made based on the greater coverage of the curriculum of these institutions as opposed to the training academies which train to the test standards. This was a published finding of the FAA in the NPRM to lower the 1500 hour requirement
I suspect the FAA will be revisiting the 1500 hour rule in the future.