Two boundaries make this page honest. The adjudication happens elsewhere: whether these tactics work at all is a question three benchmarks have answered, mostly in the negative. Tactics that test null or negative have their own article, length, schema and llms.txt a third. Nothing below re-litigates that.
The second boundary comes from the company operating the largest of these surfaces. Google's guidance states that content people find “unique, compelling, and useful will likely influence your website's presence in generative AI search in the long run more than any of the other suggestions in this guide”.6 That puts the four edits where they belong: they are the margin, not the substance.