True!
> It means nothing to refuse to take a bet like that, let alone that the claims made in the article are suspect (which you seem to be implying).
False! If the author was sufficiently confident in their claims, they'd be happy to take the free money (or, if they're sufficiently liquidity-constrained, propose a smaller bet at similar terms). You can certainly argue that the practice of betting on one's beliefs is "weird" but that objection is circular. If you claim to see free money on the ground, and other people notice that you aren't picking it up, they would be correct to wonder why.