Do we know that? All of the criticism I've seen has been of the government under-reacting. In fact, in a speech yesterday Xi told the local authorities that they weren't doing enough.

Non-Chinese estimates (as of 24 January) are that there's 6,000 people infected vs. 1,300 from the Chinese government.

The 6,000 figure comes from the Laboratory for the Modeling of Biological and Socio-technical Systems at Northeastern University in Boston: https://www.mobs-lab.org/2019ncov.html