They showed on the fly asset loading in the spiderman demo.
Demo was also in a heavily controlled environment, which would make it work because they know at all times what's happening a second infront of them. That's the exactly bottleneck they walk against with that technique.
Btw. Michael ( NXG ) has been working as a software & hardware engineer for a long time. Surely he knows something. Better than rest of us here. Based on what Cerny himself said about only needing couple of percentage frequency clock drop when the system hits its set power limit, a tiny drop of which would claw back a huge amount of power (10%). Based on that, NXGamer has calculated around 50 MHz.
Cerny also needs to sell that box at the end of the day and tell you whatever u wanna hear and doesn't tell you what u don't wanna hear. Isn't it funny how we always hear about bottlenecks after a gen is over and not before? exactly.
If NXG gamer knows something he can share his sources of information if not, its just yet another voice in the crowd.