I think the fundamental conceptual problem with Newcomb's paradox is that it basically says, "Assume that Joe's choice causes the box to have money in it, but it doesn't 'cause' the box to have money in it." Causation is necessary; the hypothetical just black-boxes it and says we can't call it "causation." This doublethink predictably leads to a great deal of confusion, which makes us dissect causality and generate analyses like these even though the problem seems to be essentially linguistic.

Edit for clarity: This is an objection to the framing of Newcomb's itself, not to the specific treatment of causation in the article. I explain in response to a response below, but it seems to me that Newcomb's requires doublethink with respect to the concept of causation, and that this doublethink makes the problem useless.