This is indeed an error in the documentation. The current airsdk-cli documentation is “too” up-to-date and refers to an internal prototype. We will regenerate the documentation according to the mission.yaml format supported by the 7.6.0 release and reupload the fixed version.
Due to caching, it might take between 24/48h before the fixed version is available online.
In the meantime, the instructions on the hello mission page are indeed correct.