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Trap for young players.
On the map for the Swiss Travel Pass, there are dotted lines which mean the trips are discounted rather than free.
There are dashed lines which indicate you are going through a tunnel (for free). 🤓
Visp to Frutigen is free with the Swiss Travel Pass.
A more scenic way to get from Zermatt to Wengen, which I think is where you are headed, is via Kandersteg. It takes about 1 hour longer then the faster route you mention but between Brig and Spiez you will travel on the Regio-Express Lötschberger train over the traditional, more than 100 year old mountain route, giving you a wonderful view along the impressive peaks and down into the Rhone Valley. The faster Visp to Spiez route takes you through the Lötschberg Base Tunnel which is the subject of your dashed-line. Not much scenery down there.