It's not real L3, it's marketing department L3. Two years after launch it's still only supported in two US states. Now that Mercedes got their headline, it's effectively abandonware.
If it was real L3, Drive Pilot would be considered the vehicle operator for legal purposes. Mercedes would take full responsibility for any driving infringements or collisions that occur during its use. In reality, Mercedes cannot indemnify you from driving infringements, and for collisions they only promise to cover "insurance costs" which probably doesn't include any downstream reputational consequences of making an insurance claim.