Every organization’s data sits in its own database, locked by its own key. Inside it, the data is walled off twice more: once in the database and once in the code.
This is the first question a carrier’s security review asks and the one where vendors are vaguest. Here is the whole mechanism, in enough detail to check.
Every line here is a statement about the running system that can be checked in a session with your engineers present, rather than a posture described in a brochure.
Isolation is about one organization reaching another. It is not a claim about every other risk, and treating it as one is how security reviews get misled.
This is a page that rewards a technical audience. Bring the person who will actually read the schema, and we will go through the policies rather than the summary.