I was thinking the same. I feel like I've seen the cycle with my own eyes at this point. Projects almost always seem fresh and good at the beginning, and then they become monsters after awhile seemingly no matter what you do.
I mean GP could have been at a genuinely bad place with bad practices.
It could also be that he was just a idealistic newbie trying to give advice to hardened experts rightfully ignoring it. HR boss agreeing does not tell us anything. They are buzzword driven.