In case you haven't figured it out yet: This offer is for a Product Key Card, so you buy a cardboard box and inside is a card with the product code printed on it. The "ESD" in the Microsoft 365 Family ESD/Licence for 79 CHF stands for "Electronic Software Distribution", so you will only receive the product code by e-mail. Apart from that, you get the same Office package.
Why the card with the product code in an attractive cardboard box is cheaper than a code sent by e-mail is not entirely clear to me, but that's fine with me :)