Can a local RODC administrator add another user as a local administrator?

For this test I created an RODC. I added a user named Adam.Carter to the local administrators group using this procedure.

Log on with an administrator account

Open a command prompt.

Type Dsmgmt and press Enter.

Type Local Roles and press Enter.

Type Add <UserName> Administrators where <UserName> is the name of the domain account that you want to assign as a local administrator on the RODC.

Once Adam was logged in I repeated the process by trying to add a user named Aaron.Lee. Aaron was added to the local administrators group. I was also able to still log on locally with both accounts and use AD Users and Computers with both. This is in contrast to Microsoft's Documentation on the topic.
Remember, an RODC local administrator cannot manage other DCs or Active Directory. They can:

Install hardware devices, such as network adapters and disk drives
Manage disk drives and other devices
Install software updates and drivers
Stop and start Active Directory Domain Services (AD DS)
Install and remove other server roles and features
View logs in Event Viewer
Manage shares and other applications and services

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