Definition of PERCENTILE.EXC (in german QUANTIL.EXKL) and related function

Hello,   I think that the description of the PERCENTILE.EXC (QUANTIL.EXKL in german) is not right (at https://support.office.com/en-us/article/percentile-exc-function-bbaa7204-e9e1-4010-85bf-c31dc5...