You're welcome.
FWIW, here's why I think Warren probably knew the directory was for minority recruiting.
First of all, the timeline. She listed herself in the directory for several years prior to getting hired by Harvard. Following her hire (and Harvard mysteriously getting the impression she was a Native American and a person of color), she stopped listing herself in the directory.
Second, her proffered explanation. She has said that she listed herself because she thought the directory was used for minority networking. But other than listing herself in the directory, she hasn't shown much interest at all in minority networking. It doesn't make sense that an intelligent law professor would list themselves expecting a certain result, and then not notice that they weren't getting the result for several years. It also doesn't make sense that taking this one ineffectual action would be the only real attempt they made to get the result they desired.
"I thought it was for networking and I didn't find out it was for recruiting until after I coincidentally got hired at Harvard (who coincidentally thought I was a minority) and I coincidentally didn't really put any effort into networking anyway" isn't a very plausible scenario, to me.
So if the question is, "did Warren know the directory was used primarily for minority recruitment?", then my answer is "probably yes".