Isn't it quite far off, though? Cf.
Sustaining 1.5 g at 570 km/h seems very different from "~2 g at 450 km/h". Although now that I look, and if I understand that graph correctly, isn't it more like 550 km/h for 2 g at max släckt?
I still think, as per this thread, that dry thrust is lower than it should be; definitely, indisputably at altitude but probably also a bit at sea level.