It doesn't seem to me he's making an argument. He's stating some facts (Superchargers aren't there yet), and his personal preference (to have a working Chademo so even without superchargers he could make a Model 3 work).
Perhaps this conversation is missing part, because we've discussed this before, where they made very clear his belief that Tesla simply won't build near them, and hence it'd be better to get a non-Tesla so that one can use CHAdeMO. It's not a discussion of whether "having an adapter is better than having no adapter".
My disagreement is the same disagreement I've had with people from west Texas, east Canada, and dozens of other locations where people come in and insist that because Tesla doesn't currently have Superchargers near them, it never will. People who then disappear as soon as Tesla does, actually, build near them shortly thereafter.
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