It asks a simple question at scale: was this made to help a person, or to game search? Sites with large amounts of unhelpful, search-first content can see site-wide demotion, not just page-by-page. This continued the direction set by Panda.
Google frames the guidance around people-first content and demonstrated E-E-A-T: first-hand experience, genuine expertise, and content that satisfies the visitor rather than just matching keywords. Since it's now part of core, recovery aligns with broad core updates.
Practically: audit for thin, templated or AI-spun pages that add nothing, improve or remove them, and make sure your best content clearly demonstrates real experience and value. That's the durable way to stay on the right side of this system.