What he means is that if you search for "Diminished by its artsiness" + "Pauline Kael" you won't find any results (except for ones related to this news story).
Google is polluted with AI generated content but not this specific bit of AI generated content.
Google is also polluted with sponsored content and ads framed as search results which are many times not at all what you're actually searching for. It's totally unreliable for finding things these days.
Google is polluted with AI generated content but not this specific bit of AI generated content.