Yeah the 'hearsay' defense is only vaild when its that 'hearsay'. Like one lone employee that runs a train against her ex employee with dubious evidence. Even then, don't say its outright lies. Say you are 'looking into it' and then let the investigation prove if its hearsay or not.
But fuck, the blizz thing is NOT that. Its tens of employees saying they were victims of the system, with a hundred more backing the claims. When the government steps in it's usually FUCKING BAD