This experiment completely misunderstands the issue of transmission vectors and how they are affected by temperature.
Aerosolizaton and droplet size and spread at different temperatures have literally nothing to do with increased transmission.
Respiratory viruses spread more readily in colder months because the viruses rely on the body's response to cold as a transmission vector. Mucous membranes, relative to skin, are much more susceptible to freezing as the temperature drops. To counter this, these membranes, such as that line the nose, mouth, and throat, secrete liquids: saliva, mucous, etc., to increase surface energy and thus decrease rate of freezing of tissues. This is why your nose runs in the cold, regardless of whether or not you are sick. It runs to prevent your sinuses from freezing solid, and thus dying.
Viruses capitalize on this by riding the waves of mucous out of their current host and into another. Likewise, they reply on the need to wipe these secretions away to hitch a ride on hands and other surfaces to move to a new host.
For viruses that rely on these mechanisms, cold weather increases transmission rate, not due to the physical properties of the droplets, but the physiological response of the body itself.