John Mueller Clarifies: Your Website “Down” Note Isn’t AI’s Fault
A Redditor linked a blog post claiming Google’s AI indicated their site was down since early 2026. The article overcomplicated the problem with terms like “cross-page AI aggregation” and “liability vectors,” which aren’t standard in computer science or SEO.
The issue? It wasn’t Google’s AI. It was a JavaScript implementation problem.
What Happened
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The site briefly served placeholder text stating the page was “not available.”
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JavaScript replaced this text for users who had scripts enabled.
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Google crawled the page before the JS ran, seeing the placeholder text as the actual content.
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This caused the SERP to show the site as down.
John Mueller’s Advice
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Avoid using JS to change text like “not available → available.”
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Serve the correct content in the base HTML from the start.
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This ensures both users and search engines see the same, accurate information.
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Similar caution applies to robots meta tags—don’t rely on JS to toggle indexing instructions.
Key Takeaways
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Don’t guess at fixes. The Redditor removed a pop-up thinking it caused the issue—but the real problem was JS handling of content.
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Understand AI search mechanics. Google’s AI answers are based on Classic Search results; it synthesizes existing content rather than inventing information.
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Ensure accurate baseline content. Always serve critical text in the HTML to avoid misleading Google or users.
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Test, diagnose, then fix. Jumping to solutions without understanding the root cause can worsen issues.
Bottom line: Google AI isn’t marking sites down arbitrarily. Most “AI issues” in SERPs are classic indexing or technical implementation problems, often solvable by serving clear, consistent HTML content.