Hello @Nicox,
Welcome to the forum!
The short answer is “yes”. The Avg is reported by the satellites, the Used is reported from the databases of your node (and they could not match the actual usage reported by OS for different reasons, also Avg is not always actual).
The estimated payout is based on the current behavior (if the customers would continue use your node like this, the payout would be… 
), you need to take it with a Gran of salt (maybe even ignore). The actual usage is calculated based on the orders cryptographically confirmed by three sides (the satellites, the customers and your node), your node send them to the satellites regularly. This information has almost no influence on estimations though (because Avg not always reported fully, see above).
Everything on the dashboard is avg stat and estimations. The actual payout you will see in the Payout Information, when the payout is done. In your case it’s likely nothing get paid, because node is too new and likely didn’t clear a Minimum Payout Threshold on the selected network (either Ethereum or zkSync Era), and your payout is added as an Undistributed payout. When your node would be able to clear it, the cumulative payout would be send.