Google critiqued the practice of displaying ads above search results
The screenshot text does not say at all what the author of the tweet claims it does (and what's in the HN title). Nowhere in the text does it actually talk about "above" and "sidebar", that is just an interpretation that the author made up about what "buying a better position in the search results" would mean. Given the context of the times, it was clearly not a statement about layout but about actually reordering the "organic" search results based on payments and without marking those boosted results as ads.