LLVM provides numerous purely technical benefits to Apple, including allowing for better graphics performance (which is an area that is important to one of Apple's key customer demographics), allowing better integration with debuggers, profilers, and IDEs, and allowing easier evolution of Objective-C.
Moglen is making it sound as if these technical benefits weren't a factor--Apple is supporting LLVM just to undermine free software.
First of all, he can't give any example of them doing anything with LLVM that actually undermines free software. He's just speculating that they could do so in the future.
Second, there is no rational basis for claiming that this hypothetical future ability to undermine free software is the sole (or even a major) reason Apple supports LLVM.
Moglen is just spreading FUD, pure and simple.
Also, how would you suggest that the submission title be worded?