“Chances are” means something is likely, right?
Because I don’t think Palace winning is likely. Possible, yeah.
Me saying they have “no chance” is a bit of exaggeration for effect, you are right in saying "you know how football Is, because of course they have a chance. Just a very, very slim one.
Some of those things you mention some people saying are of course very silly. @Phoebica is right that their team isn’t that bad.