the documentation explicitly states there is no replacement and does not mention a feature migration to the native AntiSpam, it cannot be confirmed that native AntiSpam will receive all IMS features.
The EoL announcement defines specific dates for when the product is no longer available for purchase and when support officially ends.
• End-of-Sale Date: The last day to order the product or renew/add to an existing subscription was October 4, 2025
• Last Date of Support: Customers with active subscriptions will continue to receive support and entitlements from the Cisco Technical Assistance Center (TAC) until October 31, 2030. After this date, the product becomes obsolete.
Advise is to open TAC case for more clarification or upcoming changes.
Hope this helps!!!