Google says old low-value pages may continue to affect site recovery from ranking losses
TLDR
Google's John Mueller indicates that old low-value programmatic pages can continue to harm a site's ability to recover rankings, even after removal or improvement.
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John Mueller stated that Google's systems may persist in evaluating a site based on its historical low-value programmatic content, and that demonstrating renewed site quality requires sustained effort and time to reverse ranking losses tied to that legacy content.