Hm I’m not sure this is a good example, it’s really just a dialect. Any German speaker can usually understand most of it when concentrating a bit. And Wikipedia seems to agree. [1]
Edit: these dialect are commonly used in court, public offices, and often on TV. They have a vastly stronger role in public life than in other German-speaking countries.
I think my point stands that it's a distinct language from the official one. It definitely feels like that in practice where a lot swiss people feel like they have to wear their official hat when speaking regular German and they prefer to have casual beer conversation in English rather than high German.