It’s true. Ebola is not contagious before symptoms appear, and does not spread through aerosols. You need direct contact with infected body fluids to get it.
Those body fluids, however, are extremely infectious. Hence, the space suits. It only takes a tiny splash.
Take that up with WHO. That organization has recently described Ebola as “highly contagious.”
I linked that description a few days ago.
Apparently some viruses can be highly contagious, without necessarily being airborne.
The issue with ebola would seem to be fomites.
If someone sweats on a surface and then you later touch that surface and then your face, you’re probably a goner.
Given the presence of ecoli on nearly every surface on the planet, that would be a problem.
HIV doesn’t seem to effectively transmit in that manner.
Thank goodness.