Probably not true, as we don't have 1000 deaths yet. Though, give it two weeks, and we'll easily have caught up (to where Europe is today).
Let's just throw around blatant speculation, that will help.
Speculation aside that is extremely unlikely to be the case for a variety of clinical reasons
"In fact, officials would later discover through testing, the virus had already contributed to the deaths of two people, and it would go on to kill 20 more in the Seattle region over the following days."
The US has failed to do any significant level of testing given its population, so it's understandable why many people are not confident in the official figures, especially when it becomes apparent infections have been running unchecked for weeks before testing started.
https://www.nytimes.com/2020/03/10/us/coronavirus-testing-de...
As stated before that is absolutely false which is why those cases were caught. Will data be imperfect, yes, but that doesn't mean we should start throwing around Chinese propaganda.
https://www.washingtonpost.com/world/asia_pacific/conspiracy...
I never said it would. By stopping flights, you're removing one potential source of new infections.
(Op already said as much. Your answer reminds me of my Grandmother: "I know God doesn't exist, but it can't hurt to go to church.")
That assumption is wrong, the prevalence will not be equal. One will be better off, one will be worse off. There is no scenario where the prevalence is going to be identical across such massive populations with such dramatically different cultures, population densities and healthcare systems. The US and various European nations will not act the same, they will not quarantine the same, death rates will vary, and so on. In fact, it'll vary considerably just within Europe, as we're already seeing.
It's better to separate accordingly, for both sides.
The idea that this will prevent "infected people streaming into USA" is uninformed. This step limits transfer both ways, between two regions that both have similar level of infection spread.
It may help both sides contain the virus, but it won't limit the amount of infected people in the USA on its own.
Please, be careful about the language you use, the way you wrote the sentence promotes FUD.