If your example of a 9-month contract for 75k is only halfway close to reality, 200 CHF difference in tax seems to be ridiculously low.
Sorry, don’t know if they have an English version as well. Germany is a big country and just isn’t as internationally minded. For instance, there’s hardly even any banks that offer service or even official information in English. Even the federal government (ministries etc.) only have reduced or skeleton service in English.