Is getting travel insurance in some way more important when visiting Uyuni than other typical touristic sites?

Is getting travel insurance in some way more important when visiting Uyuni than other typical touristic sites?

I am currently shopping for Uyuni 1-day tours and often see some seemingly overpriced travel insurance, e.g. from https://www.viator.com/tours/Uyuni/FULL-DAY-SUNSET-TOUR-shared-programmirror-effect/d22256-120560P3:

So I'd like to understand 1) is traveling insurance mandatory when visiting Uyuni 2) if not, is there still some compelling reason to get it (knowing that I already have some emergency international medical insurance).