To be as fair as I can be, it's believable that some WWE execs knew they were giving Vince's latest girlfriend a no-work job without knowing about the trafficking. Now should they have asked more questions? Probably, but we've known for like 40 years everyone knows their careers are at the mercy of Vince's whims.
Plus i think there's levels to the executive class in WWE as well. I 100% believe anyone who made it into Vince's trusted inner circle knew (or at least had a pretty good idea) of what went on, but maybe not so much the assistant VP of legal affairs or someone like that.