They have a new type of core on these they refer to as a "low-power efficiency core", which is probably what is enabling these "feats", but as one of the parents to this comment points out we're comparing Windows configured in "Ultra Efficiency" mode to Apple Silicon MacBooks at most configured in Low Power mode...
Anecdotally, comparing to recent (but still older than these) generations of Intel chips I can run my M2 Max MacBook Pro with 78% battery health for longer (without any special considerations) than colleagues running their Windows Intel laptops in Power Saver mode, while performing similar tasks.
The new model is Intel or amd unless I missed something. They said in the video the battery life was entirely from video playback, which can be run on efficiency mode
My apologies, I don't know where I got the ARM architecture part from. I really want one of those machines, but I guess if they can't approach MacBook battery life yet I'm stuck on MacOS for now.
I think they said 22 hours of video playback in the video. If it even gets half of that for normal usage I'd be sold, the only thing stopping me giving it a shot is they are currently more expensive than the MBP and I'm not sure if they are worth it until the first reviews come in