A laptop is whatever uses a rigid clamshell form factor with a screen that folds down over the keyboard. A screen with a flippy floppy detachable keyboard is not that, so:

- A chrome book is a laptop, it uses the laptop form factor.

- A Steamdeck is not a laptop. It does not use the laptop form factor.

- An iPad is not a laptop. It does not use the laptop form factor out of the box, it needs peripherals to even pretend to be one.

- A surface Pro is also not a laptop, but the Surface Laptop is. Just "having a flippy floppy magnetic keyboard pre-bundled with it" doesn't make a tablet a laptop. Having a rigid clamshell design makes it a laptop.

And yes, that makes the Asus Zenbook a laptop, because it is. It just has the circuitry in the screen instead of the base. Hell, Asus literally calls them laptops themselves.