I am reading the article about the CP/M operating system and wonder which computers are displayed in this picture. I have recognized the "IBM PC" only - in the middle.
The right one looks like a NEC APC or N5200.
The middle, as you rightly say, is an IBM PC.
The left one, isn't even a computer - looks like a DEC VT100 terminal to me.
So, the computers in the picture would only run CP/M 86. No "classic" CP/M 80, unfortunately, and no CP/M 68k.