actually, they do say they missed primary endpoint -- sorta. Down toward the bottom:
"The study has not yet determined results for the stated primary endpoint of recovery from respiratory failure and the secondary endpoint data reported today should not create an expectation that the primary endpoint will be met overall or for any subgroup."

Which is an understatement. 45 died in the treatment arm, and 40 would have died in the control arm if the two arms had been of the same size.