I'm sure there's some bias since it's coming from the horse's mouth, but Google does publish this stuff. Their webmaster guidelines have said for years to make content for users, not robots, and some recent updates have specifically addressed some of the AI SEO spam that's flooding the internet[1]. Their site speed tools and guidelines give very specific recommendations on how to minimize the performance impact of javascript[2].
[1] https://developers.google.com/search/docs/fundamentals/creat...
[2] https://developers.google.com/speed/docs/insights/v5/about