The headline is stupid. Its pretty obvious that the transmission happened _before_ they got the patient into an 'ebola-style lockdown'. Based on another sentence in the article, you could change the title to 'Seattle's Coronavirus spread despite a lack of testing in a critical six-week window'.
My point is, its pretty obvious how you slow this thing down, and its not much to do with 'ebola-style lockdowns', its to do with lots of testing, social distancing and hand washing. South Korea has a 2 hour turnaround on tests, in the USA its still 5 days I believe.