Your new (VPN Endpoint) IP address is actually their IP address. They are providing a tunnel, so they know both the entry and exit points as the provider. If you don't want a third party to know both the entry and exit points, you would need to use something with Onion Routing such as ToR. IP addresses are the normal means of routing on the IP based Internet. A VPN simply maps one IP to another via a tunnel. It also generally involves encrypting the traffic between the end points, but doesn't always have to.