He specifically accounts for this by stating that Apple is and ought to be held to a higher standard because they were previously the overwhelming hegemon in the industry. I don't necessarily agree with him, but the fact that Google also uses exclusively positive languages does not by itself invalidate his point. What he is attempting to point out is that Apple, who is now ostensibly under siege and on the defensive (which, although probably true, is being overrepresented and exaggerated by the media) seems illegitimate and or disingenuous when they remain so overwhelmingly positive: the whole world "knows" that they're screwed and their language seems like a facade. Google and Samsung, on the other hand, are the new dominant companies and thus are justified in using such language.