To interpret the man's comment to be suggestive of a dual-boot setup is faulty at best. There is no mention of anything regarding dual-booting, or even keeping any Apple software (let alone OS-related software) on the machine at all. Another factor to lend credence to the "he must be completely ignorant" side is that he recommends running Windows XP on Apple laptops. Granted, it could be mere semantics, but it doesn't demonstrate a robust view of Apple or personal computers in general.
The way it reads is that by going Intel, Apple is basically going halfway to Windows (semi-implying that Windows is better). So why don't they go "the whole hog" and be able to run useful applications (based on the first sentence of his post, is most definitively implying Windows is better/OS X has no useful apps.)
Sure, he has a limited amount of space to express whatever view he may have, but that means he would choose his words MORE carefully rather than less to avoid confusion just like this.
Stop making excuses for him.