Naive math? Yeah, if Drake is 6x faster across the board (CPU and GPU), then yeah, Switch 30fps becomes Drake 180fps - or 5.5ms per frame
But we also don't know what base resolution was used in that demo. Nintendo isn't stuck using the 900p that the game rendered at on Switch, they could bump it down to 720p. That's another ~20% more performance .
Also, it's possible to run tensor core load, shader load, and RT load simultaneously. For a one-frame latency cost, DLSS can be upscaling a buffered frame, while the game engine goes on to begin working on the next frame. This means anything less than 16.6ms is at least potentially manageable, though you wouldn't want to do it on a fighting game, or a rhythm game, where latency is a Really Big Deal.