Question about Hisense PL1SE

Depending on the projection size of the image (80-120"), the distance between the back of the projector and the front of the screen is between 21.5 - 42.9 cm. See operating instructions page 5; download here: https://hisense.de/wp-content...

You can also find the relevant information on the product website (vertically approximately in the centre of the page): https://hisense.de/tvs...

Why does the description state a minimum distance of 2 metres?