Not everything you read on the Internet is accurate, especially when it pertains to very old stuff from the 90s
In fact, for those of us who remember the writing the first CompTIA A+ exams, for the first 3 years you actually had a choice of which OS exam to write in addition to the hardware exam. Everyone had to write the same hardware exam (which tested both PC and Mac hardware), but for the OS exam, you could choose between a version that tested Mac OS (e.g., System 7)
or DOS/Win3.1. And the lapel pin and card you got after passing had little logos reflecting your choice. The Mac vs PC vibes were real back then.
Once Win95 gained traction, the OS exam focused mostly on that (with some DOS/3.11) and the Mac OS option was dropped entirely (for good reason since Apple was closed to bankrupt then and Macs were considered a niche market).