For what it's worth, when you view a Google search results page, part of the page is populated by ads (results come from the Google Ads teams) and part of it by search results (results come from the Google Search team, and unaffected by anything to do with ads).

The post points out a problem with the fraction that is allocated to Ads, but pretty sure that's not "everything that's wrong with Google Search" (if true, it would actually be an endorsement of the quality of the organic search results, which I doubt is the intent).

Not really, its just a condemnation of the amalgamation which is unable to be perceived as different from the user - it shits on the organic search in their mind and anyone saying "well our search is still good!" is completely missing the point.