The Gameboy lasted 30h. With all the improved processes and powering off the modern peripherals when not in use, I think the computer part should draw very little current during operation. The screen may require some compromises.
2. The Gameboy screen was LCD not LED, with no backlight, and had a 2.5 inch diagonal compared to this laptop's 14 inch diagonal.
3. Also if you read the article you will see a technical limitation was that the screen had to be run at full brightness