I read the whole article. They state the incubation period is 21 days, but contradict themselves. Regardless of that, the disease is still there in vaginal and seminal fluids for months afterwards, so it could easily be spread after 42 days, which is the cutoff the WHO uses to claim a region free of Ebola.
I don’t think it’s wise because of the possibility of transmitting the disease sexually well beyond that 42 day point.