I never want to defend lawyers, but...
From what I heard/read, as part of the settlement agreement for the EEOC lawsuit, Activision Blizzard would delete or legally seal from any employee record anything having to do with the misconduct they are accused of. Since the DFEH lawsuits is still ongoing, the deletions would mean Blizzard would be using the settlement agreement of the EEOC lawsuit in order to destroy evidence related to the ongoing DFEH lawsuit.
IMO, it just looks like the two attorneys that worked at EEOC and DFEH didn't want the EEOC to settle the lawsuit for just $18 million, which is barely pocket change for Activision Blizzard. So, they left and starting a new lawsuit via the DFEH. That said, the lawyers get paid either way, so maybe they are just greedy bastards.