That is unlikely. What is more likely — as there is significant historical evidence of it — is that GW has a legal department entirely run and staffed by the closest equivalent to ghouls we have.
>There's no reason to expect that the people currently employed at Games Workshop know that the company had borrowed the term in the first place.
You say that like sticking two generic words next to each other is somehow novel or noteworthy. I wouldn't call it borrowing or infringing when the thing in question is utterly mundane.