It's a good idea I guess, but, it seemed a little vague to me if Disney was actually financing that or if they are just stocking up on supplies to be purchased. I can understand them wanting to fend off as much negativeness as possible, but, I, frankly, am surprised that they are taking it upon themselves to finance the medical care of others especially since no court in the land would hold them responsible for an outbreak of a virus.
Also, sure that could be a real good reason for them to fill up the pool at this time at River country since stagnant water is a great breeding ground for those pesky little critters. But, that is just PR spin. With all the swamp land in and around the property that is like peeing in the ocean and waiting for the level to rise.
On a separate note, in all my trips I don't remember ever being bitten by a mosquito even once. Must be they don't like dead meat.