What Lisa Sue presented was Big Navi => Navi 21. Which part? RX 6800XT or RX6900XT. If the 6800XT competes with the RTX 3080 then the 6900XT will compete with the RTX 3090. We do not know how much headroom these chips have, Nvidia 3080 and 3090 basically has none over their stock configurations or very little in general. So knowing those performance numbers at 4K for Big Navi, most likely not OC or set, still can have significant changes as well as having significant clock speed potential.
AMD rarely if ever sandbags when they show off a product. Remember when they showed off an 8-core CPU (that would later be revealed to be the 3800X) and said it gamed better than an 9700K? They were technically correct because it was Forza Motorsport that it was gaming in, and it was still a great product, but they showed it in the BEST POSSIBLE LIGHT.
Chances are those benchmarks shown have Raytracing disabled for a reason, and the selection of games is probably hand-picked to show off the BEST numbers they have to offer.
AMD is generally $100 higher than it should be so I am going with $699.