At the moment that the thing is operated and owned by an US company, they are subject to the law and will of the US government and so obviously not sovereign.

I'm wondering if someone could sue them for "deceptive marketing statement" under European law.

Sadly a lot of company will pretend to believe the marketing of aws to have an excuse to use aws and pretend to be using a safe sovereign cloud.

Also, I have doubt that the European employees and entities with all access and review to source code, and everything. It will probably be European technician running black box servers in an European data center.