When running a full cleanup (https://{AccountName}.myvtex.com/admin/Site/fullcleanup.aspx) on catalog, the broadcaster doesn't send the update notification to the Intelligent Search indexer, and product data can become outdated, causing discrepancies between PDP and PLP content.

Run a fullcleanup in Catalog, and the deleted products will still be active in Intelligent Search.

VTEX doesn't recommend deleting products from the Catalog, a better way to deal with this scenario is flagging the products as Inactive.

If a fullcleanup is necessary, call VTEX Support and ask for a forced indexation in Intelligent Search.