Spreading as an aerosol is not the same thing as spreading through air. Furthermore, would you not rather the CDC take the extra precautions rather than "oops looks like it can spread in the general vicinity of the person, not just through direct contact"
When it comes to biohazards, there is no such thing as too much protection. If you get Ebola you're (most likely) dead. That's not a chance I want people to start taking.