This is Polymarket, not Manifold. It's not "anyone can create a market and can resolve it however they want". Polymarket creates the markets and resolves them, so an unfair resolution could undercut their reputation and hurt their business. People know what "Jesus returning" means and if they interpret it some other way people won't just say "oh well I guess that was technically within the criteria".

Again, this is in the article! If you want to argue it's a problem, you should start by responding to what the article has to say on the subject, not just asserting it from scratch as if it isn't discussed!