It is kind of amusing but I suspect they are still tuning their performance with the Navi GPUs and/or they weren't available in time for benchmarking.
Completely agree mate, I'd have done the same. Right now they 1). Want to keep 6000 series underwraps and 2). They know that 5700XT won't show off their CPU as well... so why not use something the world loves and owns right now, a 2080ti instead, as everyone can relate to those at the minute to show off their CPU's, made perfect sense, however I've never ever seen a rival use each others hardware, and fair play to AMD doing it tbh, they're not hiding anything at the minute.
Based on the 5000 series CPU launch demo which didnt' even have BS in it really i.e. when they showed the gaming benchmarks againsts Intel, the didn't compensate for the fact that they're currently in Zen 2 around what, 15% at least slower than INTEL in a lot of gaming benchmarks and now they're ahead in most fo them even showing a negative in there in one of them, was it BF5? Can't remember... anyway...
...that there is more honestly than I was expecting tbh.... so based on this, I believe whatever they come up with on 28th Oct it's fair to say it'll be decently honest, maybe they've looked at INTEL's recent terrible CPU launch both in mobile and desktop and nVidia and thought lets just be honest>? Who knows... we shall see.
I'd love them to turn up and say BTW, crossfire is BACK!!! 2x6900XT's would be lush!