That is a form of Accounting, yes. There are others though, like metrics, and Accounting is meant to mean all of the recording/telemetry.
I can see this thread rabbit-holing into logmon terminology :]
This also goes back to dial-up days when your third party modem bank provider would also send accounting packets as well as authentication and authorization.
Came here to say this. Is how i learned it decades ago and the importance of each with Radius.