Hello LisaL
Yes, it does mean that.
Have you had a look at the validity map for Saver Day Passes? There you can see that the route from Visp to Zermatt is covered as well (you might have to zoom the map to see the route).
https://www.sbb.ch/en/tickets-offers/travelcards/area-validity-map.html
Isn’t that cool?
Depending on the number and type of mountain excursions you plan, a Swiss Half Fare Card is a very good investment. Provided you are going to spend an amount of CHF 240 per person on public transport tickets & mountain excursion tickets, you are break even.
Kind regards,
Roland