When he said the system was good, it was unprompted, nothing to do with not wanting to publicly put down DJ, he was asked what he was going to work on, highlighted some positives then moved on to discussing what he planned to address.
Also, just because he's made changes doesn't mean he thought the old system wasn't a good system either, every coach will want to adapt things and make them their own, tweak aspects that other teams have adapted to, and try and adapt to what other teams are doing. What is noticable to me though is regardless of what aspect of our system we look at, there appears to be more attention to the details, less shortcuts being taken.