I believe he's referencing the the classic enemy of 68k mac, the IBM PC running MS DOS. But in the end IBM helped make PPC processors for the newer macs.

Don't worry, IBM does have some loyal fans, just ask anyone if they'd rather the Thinkpad X300 or a MacBook Air.

I like IBM manuals because they're like the Apple's because they

A) Are written in proper English

B) Have part listings and compatible parts (you can tells what safe to swap between models)

C) Good details about components (revisions, voltages, connection types)

D) Take apart diagrams and

E) Troubleshooting diagrams