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Mitesh, I can't tell why is that Westfall's response written that way.
However, as a matter of principle, when it comes to EOS technical issues, I tend to place faith on engineering info published by Canon Inc. Japan, by the very folks who designed, built and tested the equipment, and not on secondary & tertiary interpretations and understandings by Canon's regional distributors.
When Canon Inc. is silent on an issue, then it is harder to understand what's going on.
I can't remember where I read it but someone said that the 1DX was able to drive the AF of the 85L 1.2 faster then previous 1D bodies and they referenced Westfall's quote in the blog/article. While certainly not any kind of proof it was an interesting read as the person sounded like they had a lot of 1D experience.