Google's jQuery CDN is hosted on a separate domain (that doesn't share cookies with Google services like AdWords, AdSense, and Analytics). Blocking Google.com doesn't block their jQuery CDN, nor is there a good reason to block their cookie-less CDN domain.
My guess would be it's because the comment was factually incorrect.
From an ad-blocking perspective, the Google AJAX Libraries CDN and the rest of Google's properties are in no way related. The Google API, Libraries CDN, and supporting documentation is the only thing on the googleapis.com domain.