We have been consistent on this from the begging and it is in this FAQ:
https://support.maxon.net/hc/en-us/articles/4403846234258-Redshift-Subscription-FAQ
Specifically:
I have a valid Annual Maintenance Agreement that extends beyond August 30th 2021 – what happens to me?
If your Annual Maintenance Agreement extends beyond August 30th:
You'll continue to have access to all Redshift builds released until your existing maintenance expires.
You'll be able to renew your Annual Maintenance Agreement up to August 31, 2023.
You will have the ability to add new subscription licenses at any time.
And:
If I don’t convert to subscription what happens when my Annual Maintenance Agreement expires?
When your Annual Maintenance Agreement expires your Redshift license would be locked in on the last build published before your maintenance expires. You would no longer have access to the latest builds of Redshift. Note that you can purchase an additional maintenance agreement within three months of your expiration. In other words, if your current term expires in August 1, 2022, you cannot renew prior to May 1, 2022.
So your SSA is past the renewal date of August 31st 2023 and yes we have mentioned the 3 month limit since we rolled out subscriptions.
Cheers
Dave