The reality is, that back then, there was simply no better information than "coming from China". It wasn't based on xenophobia at all, just on common sense (that seemed to defy the Democrats / mainstream media). In beginning of March, Trump also closed borders to Europe. Xenophobic? No, Europe was having a spike (e.g. Bergamo, Italy). EU "president", Ursula von der Leyen, criticised the decision. 2 weeks later, EU closed its borders. (Ursula is another person that prefers politics to common sense.)
Something seems to have gone really badly wrong in Italy and it's somehow gone entirely unexamined by the media, despite the fact that it did more to doom the rest of the world's efforts than any of the countries that have been blamed for doing so. Entirely unrelately, Italy is lead by the kind of boring technocrat that the media likes rather than some Trumpian populist figure.