When I onboarded at a global AAA game dev place in Japan, I got a separate sheet detailing my rights as a whistleblower - it's lucky to have these, but I doubt anyone would risk their standing/future in the industry because of something like this, especially during a pandemic.
Of course you can fight it, but while you do you still have to pay your bills and pay a lawyer, all with no income and no guarantee that it will ever make a difference, let alone when it would be resolved.
EDIT: And all that presumed that the whistleblower protections would actually apply in this case. If it were something clearly illegal you’d have a better case, but really here all you’ve got is possibly fraud and a pretty mild version at that. Proving fraud is tough...