I believe they’re arguing that AI is particularly used in news, and when looking up news, you’re typically seeking current events, in which case excluding post 2023 content doesn’t work.
In my opinion, the place I encounter AI content the most is in list content, not just clickbait lists but also stuff where multiple products are compared. If I’m looking up what laptop to get, AI articles pop up comparing 10 products with inaccurate and messy details, but also I don’t want to see old products.
Also IMO, in many cases Google search has been useless for 6+ years now. I think it was around 2018 where I started ending my search terms in ‘reddit’ because the first few articles were poorly advised clickbait, especially when looking for any advice (Reddit of course went to shit anyway). Google is only useful now for navigating to popular sites that will inevitably float to the top of any search query due to popularity. The only other common use for me is correcting typos when autocorrect is stumped.