There is a somewhat justifiable reason for the author to jump to that conclusion – VMware Fusion 4.1 (accidentally?) supports the virtualization of Snow Leopard

There is a somewhat justifiable reason for the author to jump to that conclusion – VMware Fusion 4.1 (accidentally?) supports the virtualization of Snow Leopard, which violates Apple's EULA. That feature was very quickly removed in a 4.1.x update. Given that Fusion 4.1.0 is blacklisted while 4.1.3 works fine on Mountain Lion, it's not entirely unreasonable to think that Apple purposefully disabled 4.1.0 to prevent users from virtualizing Snow Leopard against their will. Not the conclusion I would have jumped to right off the bat, but I can see the train of thought.