R6 — Quarantine vendor CTR / AI-citation multipliers; the only clean primary figure (Nestlé 82%) is single-company and ring-fenced

Rule: Any "Xx CTR uplift from structured data" or "Yx more likely to appear in AI answers" claim that does not come from primary search-engine documentation gets quarantined. Use the structured-data recommendation on the mechanism (Google Search Central — structured data labels each individual element so users can search by ingredient, calorie count, cook time, Google Search Central — product rich results require "a distinct URL" per product (or per variant); confirms one findable page per record, schema.org — ItemList / ListItem / Product / Offer types exist precisely to mark up individual records and lists as machine-readable structured data), not on the inflated multipliers.

Why: The only clean primary CTR figure is the Nestlé 82% — one company's self-measurement, RING-FENCED (Nestlé 82% higher CTR on rich-results pages — Google's own documentation, attributed to one named company; RING-FENCED, never present as typical, R4 — Do NOT generalise the Nestlé 82% CTR figure; it is one company's self-measurement, never present as typical). The SEO-vendor claims (35% CTR, 2.5x AI, 40% more AI Overview) are quarantined (QUARANTINE — "Pages with structured data earn 35% higher CTR" / "2.5x higher chance of appearing in AI answers" / "40% more AI Overview appearances"). Google itself rejects the "structured data is a ranking factor" framing (Google Search Central — structured data produces eligibility, not a guarantee; does not guarantee rich results even with correct markup).

How to apply:

• When a client cites a vendor CTR multiplier, the response is the mechanism citation, not a counter-multiplier.
• Internal sales decks / articles / proposals lead with mechanism and eligibility, not numeric uplift claims.
• The acceptable magnitude citation is Baymard's 67-90% vs 17-33% (Baymard Institute (2015) — sites with mediocre product list usability saw 67-90% abandonment vs 17-33% for sites with even a slightly optimised toolset) — independent, primary, with explicit age + scope caveat.