As a German speaker that has worked in Zürich, the parent is correct.
Wikipedia has the following to say:
The dialects that comprise Swiss German must not be confused with Swiss Standard German, the variety of Standard German used in Switzerland. Swiss Standard German is fully understandable to all speakers of Standard German, while many people in Germany – especially in the north – do not understand Swiss German.
Wikipedia has the following to say:
The dialects that comprise Swiss German must not be confused with Swiss Standard German, the variety of Standard German used in Switzerland. Swiss Standard German is fully understandable to all speakers of Standard German, while many people in Germany – especially in the north – do not understand Swiss German.