Smach Z still haven't had an actual working prototype until today. Those gameplay benchmark videos was recorded from development board which they fondly called "final hardware". The prototype PCBs they presented at Embedded World 2018 are non-working actually because of bugs.

They have to wait for a new revised PCB to be delivered and tested which means another delay. The case was shown was 3D printed, thus no actual final production casing. Also without an actual working prototype, they definitely cannot test the battery life.

Thus take everything they advertised a huge grain of salt. There are lots of other problems as well, one example was Windows 10 licensing. They also have not decided on the battery supplier yet!