That’s an ultra short throw which is different as it’s aiming for around 2 inches from the projector to the screen. Short throw is more in the 4 foot range while producing an image several times that size. https://youtu.be/Fu_U0HS7axk

A normal projector is 11+ feet from the screen. The diagonal being approximately the same as the distance from the projector to the screen.

I have seen short throw 4K projectors from around 1,500$ but IMO they are a poor fit for home theater as the screen ends up as a bright object in people’s view.