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I think his point here is not that Montero can't catch, it's that Zunino/Jaso can probably catch better, such that he's more valuable to another org which wants him to stay behind the plate. If he's more valuable to somebody else than to you, then you could theoretically flip him for something that's more valuable to you than somebody else, if a deal like that is out there.
I get the he's got a longstanding viewpoint that Montero can't/won't catch, but I don't think this piece suffers from that bias; rather, it's more about exploring an alternative idea for maximizing the ROI on a talented young major league hitter.