This is one of those "holy shit, that's amazing" kinda inventions.
Discussion
Is there a guide on how to try this out? Where can I learn more?
coinjoins.org for an overview of all implementations.
docs.wasabiwallet.io for the details on Wasabi, but it's super simple, just download, receive, wait, spend, and everything should be private.
And this is using that
Oh, sorry, my answer totally did not address your question, I didn't see the top level question.
No, coinjoin has nothing to do with cashu.
This is a LN address server, which when it gets called fetches an invoice from a cashu mint, as soon as it gets paid, the mint issues new ecash tokens (nuts), sends them to the LN address server, who then forwards them to the npub that was in the address.
neat! thank you