You're right, but I think that may be what the OP is actually asking for. They talk of "zooming out" but I don't think they mean so they can literally zoom out and see all 100b nodes individually on their screen at once but instead mean that some high level / clustered view is shown to give an overview.

That being the case, I think you're suggesting that this high level summarisation happens as a separate preprocessing step (which I agree with FWIW) whereas I think they're imagining it happening dynamically as part of rendering.