What I read there backs up what Tom was saying.
George S. maintains that they did nothing wrong. However, he says it gives the appearance that they did something wrong because they aren't being forthcoming about it. Therefore, they should be forthcoming about everything.
Hillary, not wanting to divulge this information (which this passage doesn't explain at all why that is) gets mad at him for not taking her side of it, and accuses him of not believing in her.
This passage in no way insinuates that there was a cover up.