Google SEO
Best practices — Google Spam Policies
Why must markup match visible content?
Marking up a price, rating or other information absent from the visible page violates structured-data policies and can lead to loss of the corresponding rich result.
Further analysis
Use this entry as an audit checkpoint. The cited source establishes the context; the direct answer identifies what to check before choosing an action.
In SFT, this topic relates to Trust. Check whether the signal is visible on the page, connected to the rest of the website and supported by understandable evidence.
Related search terms include structured-data spam, misleading markup. Use them to describe the issue in a brief, audit or answer page.
Applying SFT
Trust requires observable evidence: sources, consistency, citations, identifiable authors and verifiable claims.