I don't think that will stop Blizzard from attempting to arbitrate with the mistreated employees/former employees, but do you know if such arbitration would eliminate CA's ability to pursue the case?
I'm not familiar enough with the laws regarding this case to make any sort of estimation. I'm just thinking back to incidents of corporate malfeasance in which a company denies wrongdoing while paying a fine, and whether or not this could play out similarly.