I want to know if it can be spread by the aerosol action from the flush of a toilet used by an infected person?
The word 'aerosol' doesn't really fit there but can it be spread by the back splash of contaminated water droplets? Yes, definitely.
The toilets in Atlanta were first treated with Bleach and left sitting for a designated time before flushing.
Experiments have been done that show if the lid is up, bacteria from toilet flush goes quite a way all around the bathroom. So I’d be willing to bet that you could get a lot of contamination from flushing without treating with bleach and closing the lid.
I’d think the whole toilet and surrounding area would need to be treated with bleach to try and make sure all the surfaces were decontaminated.