I think there are legitimate grounds for suspicions, especially given the past history of Chinese swimmers and dope. But at the same time, it is easy to make accusations without evidence. Let's see if the accusers can bring evidence to back up their claims. Innocent until proven guilty. Guilt by association (in this case past history of doping by her predecessors) is not a valid method to show guilt. The burden is on the accuser to prove it.
And if I am the devil's advocate, the accuser's motive aren't as pure as we might think. This could be a strategy to pyschologically attack Ye by rival team's coaches so that she stand less chance of winning in the upcoming 200m race.