Feb 11? Yeah... it was studies like that built with suspect data from China which should have come with massive warnings.... in their title.
I will agree that they do not have a handle on the actual R0 of COVID-19. Proper data and more time is needed to arrive at a realistic conclusion.
Most of the initial studies show an R0 of above 4.
One example -
The Novel Coronavirus, 2019-nCoV, is Highly Contagious and More Infectious Than Initially Estimated
https://www.medrxiv.org/content/10.1101/2020.02.07.20021154v1
This particular study shows the value is likely between 4.7 and 6.6