Why use DLSS that causes minor artifacts to a game?, which just lowers the res in anycase, when a person can lower their res themselves without those minor artifacts.
From my quick test 4k DLSS quality had less fps and used slightly more power than 1440p.
The extra frames from DLSS, that you say is so important can be had by lowering the res yourself and you can still add your fake frames to boost that as well, with frame gen.
As I have said above, their display might be set to 4k, but since they used DLSS to hit that high number they weren't gaming at a res of 4k. If I'm not mistaken it was at a res lower that 1440p.
So no, you still haven't seen "high triple digit frame rates at 4k"