The term "open source software" was coined specifically to refer to software licensing that recognizes a particular set of freedoms. It is not a generic term for source-available software, and never was.
One of the freedoms of open source is "no discrimination against fields of endeavor."
Calling the Hippocratic license family "open source" is inaccurate, since its entire goal is to discriminate against certain fields of endeavor.
It's better described as a sort of source-available license.