This did not happen as far as I can discover - there were stringent lock down measures in Wuhan, but they came very late. In fact six weeks into the outbreak the Wuhan authorities held a party for 40k people. So - in fact it was the opposite, they treated it recklessly, which makes me think that they didn't have much to hide (until they realised that they had recklessly let it, whereever it came from, get out of control).