Thanks to @chris1515 for linking me this thread. I counted another frame here later in the Trailer and got a 7/10 count, so slightly above 1440p once. So Yeah, "4K"
Temporal upsampling +DRS is really nice and all, but Yeah, Marketing is going to be playing it fast and loose with calling games 4K when really... They are not 4K in that strickt sense.
But hey! This is good news - as it means pigs do not fly and the GPUs here are performing like they should. It turns out ray tracing is expensive when you do it in a through way? Who woulda thunk it?