Don't worry and order this power supply. You know your rights as a customer, unlike many others. Namely, to a correct Swiss plug. If you forget to include it again, it should be sent to you free of charge.
Let me put it this way, Digitec will not have fixed the error yet. They haven't replaced all the humans with robots yet. But even that would not be a guarantee. It is not the case that a cable with a Swiss plug is never supplied. It's just that every now and then, when it's forgotten, the extra cable is included. For whatever reason. But you're right, it's a bit surprising how "often" this mistake happens. Actually, there should be a note in Digitec's own system that an additional cable or adapter must be added to the delivery. If the packing list of the logistics company says 1x box of power supply + 1x power cable. You don't quite understand it if the number of products doesn't match the packing list.

If you really want to be 100% sure. Pick up the power supply unit in a shop. You can check right away. There are always enough cables in the shops and the shop staff are very attentive.

And for the sake of completeness, my favourite text module ;-)

-----8<------------------8<------------------8<------

Digitec is obliged to supply electrical appliances with a Swiss plug. If the appliance comes with a foreign plug, a suitable replacement cable should be supplied if the mains cable is pluggable or, alternatively, a suitable adapter if the mains cable is permanently connected.

If the appliance is delivered without a suitable plug, complain to the customer service and insist on a cable or an adapter, free of charge.