> How would you fix it? "Astronomer finds an exoplanet which fits exclusion criteria if WOW! Signal is intelligent in origin"?

As far as I can tell there's not even evidence of an exoplanet around that star (likely because that star hasn't been searched for evidence of an exoplanet). The arXiv preprint basically amounts to "Identification of a Sun-like star in the same part of the sky where the 'Wow' signal originated."