I don't see anything wrong with this tweet. At the time, this was the only information available about the disease, and the source and preliminary nature of the research are clearly stated.

One week later, the WHO had already conducted its own field visit in Wuhan and concluded that human-to-human transmission is likely taking place [1].

[1] https://www.who.int/china/news/detail/22-01-2020-field-visit...