Yes, been watching that too, BEags. Very interesting. We taught our F-15 students to operate the jet at 9g. Not for 5 seconds, for the whole fight, which admittedly would be descending and would eventually reach base height. Then you can't descend so it all slows down and the g reduces. But that was sustained 9g. And not just sitting up straight, but twisted round looking out the back in the case of Defensive BFM.
In fairness the Hamster missed out the bit about wearing an ordinary g-suit and a well-trained straining manoeuvre. 9g isn't the best place in the world to sit, just for fun. I did it the USAF's centrifuge and hated it. But it's quite do-able in the jet.