"This doesn't mean there isn't any evidence--it just means that their internal investigation didn't find any."
How could you ever claim anything else, though? You can only make a claim about the things you did find (including absence of things), not about things you didn't find, because you can not know about them.
This is just another example of human communication depending on goodwill. If some involved parties want to misinterpret everything they hear, there is no way to stop them.
I think the emphasis on "gender based" stuff is because that was the gist of Horvath's accusations.