Stealth mode is no DNS you can see it the fields of DNS is empty when using it and you can use other DNS servers with it
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No Incognito deletes your Certificates which are used to ban a console BUT when Nintendo doesnt has a CERT maybe they log you and then ban you when you disable it
Stealth mode is a simple Nintendo blocker.
90DNS is the same like Stealth mode BUT uses a other method for disable Nintendo Connections