At the time, a CP/M machine was a business machine, because it could run a word processor, a spreadsheet, and dBase. (Literally the name of the database program from Ashton-Tate.) So you could buy a "serious" CP/M machine, but not an Apple II, which was an educational/hobbyist machine.
But if you bought an Apple II with the CP/M card, it was a business machine again.
The ways of people and accountants are strange.