Lots of site operators explicitly allow Google and block other search engines.
While this may be true, I'm still confused what it has to do with quote searches.
If it were me, I'd be waiting for his "sources" so I can tear them to pieces for not being the NYT or something trustworthy and 100% truthful, all of the time.
Why would there be sources? [Unrecorded] phone call / encrypted-channel deals happen all the time. Do you want to pretend it doesn't happen and the world is actually fair? What a nice dream.
Those sites will lose out in the long run I suppose.