Hi David, that’s right. At least it’s not being offered as a full SaaS solution yet.
You could ask your Solace Cloud Support to enable the feature for you and connect your own PubSub+ Cache instances (running in your public or private cloud account) to a Solace Cloud instance, if you want to run it in the cloud (broker SaaS, caches non-SaaS). I believe that could be supported.
But yeah, fully on-prem (or better non-SaaS, because you could operate all of this yourself in cloud) is definitely the more common deployment option with PubSub+ Cache at the moment.