I remember a different apocrypha for why they skipped from 8 to 10. They wanted avoid OS specific code that conditionally activated from the substring "windows 9" but meant for windows 95 and 98. One would imagine any code like that not being quite as helpful a few decades later.
If true, this would align with Microsoft’s historic dedication to backward compatibility in the face of horribly-written third party software.
You misread the GP. The versioning skipping from 8 to 9 was because of bad detection code for windows 95/98. The GP is talking about people staying on Windows 7 until Windows 10 came out, skipping Windows 8.