Basically. Since we are focusing on SSH in this post (and keep in mind that SSH is its own protocol, separate from TLS), it's conceptually the same: client has a certificate and a key, signed by a trusted certificate authority, and the client is also in possession of the server certificate authority. So then you have a bi-directional trust established. The certificates are short-lived, and issued after a successful authentication + dial request to the OASA service.