I think the author is assuming that only AI is corrupting the web, whereas the Internet itself was built on broken links and misinformation... search engines/etc. were already introducing noise.
I will also add, AI code is ugly, yes including Opus 5.5. And I haven’t seen this improve much, gpt 5.6 to Astra was a big step down in code quality, and Opus 5.5 is a step up from fable, but I feel 5.6 is at the level of Opus 5.5. To this you might see, I only care about functionality of the code, fine, you might only care if the code was making you money, I don’t, I care for how good, nice and well architected it looks and feels, and expert humans are still miles ahead on that.