I read the chart at your link as typical progression of symptoms. But the heading above that says the 2-21 days.
If you are vomiting and the other descriptions of day ten, those are the symptoms. It may not start for 21 days, it might start after only 2.
I get it. Example with the flu Day 1 Headache backache Day 2 Fever Nausea So if day 10 of contracting the ebola virus (not the 2 -21 day incubation period) is vomiting, he was taken from the building by ambulance vomiting on 9/28, that would mean onset of the disease is much earlier than 9/26 as officials would have us believe. I cant imagine how many people he was in contact with....and then how many people they were in contact with. Not 18 and much more than 80.