Well yeah, it's in the article - at some point, they switched completely to metrics (i.e. revenue) driven management and forgot that it's the quality of results that actually made Google what it is. And, with a largely captive audience (Google being the default-search-engine-that-most-people-don't-bother-or-don't-know-how-to-change in Chrome, Android, on Chromebooks etc.), they arguably don't have to care anymore...

Well, it's in the name. SEO is a fancy name for trying to game whatever heuristics Google employs to form their SERPs. It's just that at some point those heuristics shifted from rewarding "quality content" as defined by the disgruntled towards enshitification.

There are various kinds of SEO - internal: technical, on-page and external. A long time ago Google had an epiphany that instead of trying to make sense out of sites themselves they could offload that effort to website administrators and started ranking pages how well they implement technical elements helping Google index the web. For a very long time that was synonymous with white-hat SEO. Since Google search was in part based on web-of-links, various shady tactics to inflate number of indexed backlinks and boost rankings. That was black-hat SEO.

These days Google search puts tremendous focus on on-page SEO. So much that as long as the internal structure of a site is indexable (no dead links, internal backlinks, meta info) it is typically better to hire copywriters spitting out LLM-like robotic mumblings than to try and optimize further.

Massive media companies finally caught on and started churning out utter shit because it's wildly profitable.

When the 'trusted websites' caught on and embraced the game, Google was apparently helpless to stop it.