I think a statement would be a positive PR move at best and we all know that this organization could really benefit from some positive PR.
There was a statement; the team acknowledged the alleged event, said it held all employees to the highest standard, and would provide more information when it became available.
I mean, I suppose they could have disclosed that they were doing their own internal investigation into it (I'd assume they are regardless of no official statement) along with any other administrative actions they are taking, but I'm not convinced that would really change anything. The team needs to balance competing risks; legal liabilities related to Lee's actions, Public relations, and ensuring they don't violate any of Lee's rights before it is determined whether or not any wrongdoing happened.
I think there strategy was probably hope this stays relatively quiet and out of the news cycle; they didn't want to air out their dirty laundry for all to see, rather, they hoped it could be handled behind closed doors and in the courts, and the appropriate action taken when due process had been done. I'm note sure I really blame them for that, even if it's found out that Lee was not in the wrong (as in the allegations were false) there is damage is done.
I think it's fair to give the org the benefit of the doubt until after this is settled in the courts. Their actions at that point will speak volumes.