In any case, policies need to be enacted now (or rather two weeks ago) in any but the best case scenarios. There is no time to wait for more accurate information. If one argues that exaggeration is rampant and we should learn more before making hasty decisions, then that's essentially arguing for inaction. Even if that was the right action I suspect the induced panic in the society will be even greater.
The author also seems to be implicitly weighing the dire consequences of a pandemic (maybe millions more people dying) against the supposed reputation damage to science, which is bizarre to say the least.