I may be misunderstanding this but I think it is saying that no live virus has been detected after 9 days.
So if you take off 5 - 7 days before symptoms appear, a day or three to fix a test then you are only just about in the window of having a positive test. Presumably if it all takes a bit longer then although you could be still suffering you have no live virus left in you.
It does say that "patients with SARS-CoV-2 infection are likely to be most infectious in the first week of illness" which is quicker than SARS and MERS.
But the paper is all a bit technical so I may have come to the wrong conclusion.
www.thelancet.com/journals/lanmic/article/PIIS2666-5247(20)30172-5/fulltext#seccestitle10
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