When Lavander gets into the details, things are a lot more conservative than the press releases. Crew augmentation and full-period remote control "local" by 2020, full period remote control coastal and self-steering between waypoints with remote control docking 2025-2030, fully autonomous by 2035.
It is clear from this, and an article in Offshore Engineer about "autonomous" underwater vehicles, that the term is being applied to what are essentially ROVs that can run on autopilot for some interval. In the case of the OE article, "autonomous" means "without a tether cable but still within sonar signal range." The concept there is to use unmanned surface vehicles as signal relays so the "autonomous" swimmers don't have to stay close to the mothership.
"Blue skies, smilin' at me,
Nothin' but blue skies, do I see."