Their case would be against the PL, not us. They would need to prove the PL were wrong to sign off on our accounts, and the independent financial auditors were wrong.
If they were successful, any case against us would have to be based on us being aware the PL were deliberately making a mistake on their own rules. I'm not sure how they can win such a case. Some of this is a conflict of interest stuff, that the rule setters are the rule deciders, but honestly it would be very hard to prove EFC were knowingly aware the PL-the rule makers- didnt understand their own rules.
Our defence would be, as per the information given, we submitted independently audited accounts that were agreed by the PL. We could not have known corruption/incompetence was going on. I cant really see how the club could lose.