ARFoundation does not support Restore AR Content After Relocalization?

Unity Engine
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https://docs.unity3d.com/Packages/com.unity.xr.arfoundation@4.0/manual/index.html

How does arfoundation use ARSCNView And func renderer(SCNSceneRenderer, didAdd: SCNNode, for: ARAnchor)？

Saving a world map also archives all anchors currently associated with the AR session. After you successfully run a session from a saved world map, the session contains all anchors previously saved in the map. You can use saved anchors to restore virtual content from a previous session.

The same ARSCNView delegate method renderer(_:didAdd:for:) fires both when you directly add an anchor to the session and when the session restores anchors from a world map.

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ARFoundation / ARKit does not use ARSCNView.

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@todds_unity

arfoundation …How to get the saved ARAnchor after loading the worldmap?

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See the documentation for ARKit ARWorldMap.

The arfoundation-samples repository includes a sample scene ARWorldMap.unity that demonstrates how to use the ARKit ARWorldMap in an AR Foundation scene.
https://github.com/Unity-Technologies/arfoundation-samples