I think what they mean is you can't give your info to another person and have them use it. But you CAN order a ride for them yourself and not be in the car. Except if they are under 18.I think that is what Uber refers to in their TOS as "third-party usage."
I have read here of some drivers that will refuse to pick up if the pax isn't the account holder. I don't think Uber/James River would cover you if the account holder wasn't in the vehicle.USER REQUIREMENTS AND CONDUCT.
The Service is not available for use by persons under the age of 18. You may not authorize third parties to use your Account, and you may not allow persons under the age of 18 to receive transportation or logistics services from Third Party Providers unless they are accompanied by you.