Google's September 2026 spam update started on 24 September and the rollout was complete on 8 October, according to the Google Search Status Dashboard:
https://status.search.google.comMy write-up on checking whether an update hit you:
https://aiwebpageseo.com/blog/last-google-spam-update-check-siteDid your traffic move between those dates? Which pages, and what kind of site? Anything with a Manual actions entry in Search Console?
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