It's possible that:
* This is a misnomer: The name might be incorrect, or there could be a different spelling.
* This person is not well-known: If the individual is not a prominent figure in the conspiracy theory community, their passing might not have been widely reported.
* There is no such person: This might be a fictional character or a misunderstanding.
If you can provide more information about Klaus Wagner, like their specific area of interest in conspiracy theories, or any other details, I might be able to help you find more information.