The article states “ It took until the end of January before the WHO declared the coronavirus outbreak needed to receive international attention. “
Which appears correct. Per the date you mentioned of Jan 20th, here’s an article referring to China’s position on that day:
https://www.cnbc.com/2020/01/21/china-coronavirus-human-to-human-transmission-confirmed.html
The Chinese official investigating a pneumonia outbreak stemming from a new coronavirus said the disease can spread from person to person but can be halted with increased vigilance, as authorities on Tuesday confirmed a fourth death.
Zhong Nanshan said there was no danger of a repeat of the Severe Acute Respiratory Syndrome (SARS) epidemic that killed nearly 800 people globally during a 2002-2003 outbreak, which started in China, as long as precautions were taken.
The WHO is a terrorist organization!