Not suggesting that hot weather kills the virus, just that there are studies that suggest that hot humid conditions slow the spread of the virus. And
Orlando in August is hot and humid. So they might be better off playing then and there, as opposed to waiting to start up in October.
https://azbigmedia.com/business/will-warm-weather-slow-covid-19-here-are-some-answers/
"However, the MIT study – which looked into global cases of COVID-19 from Jan. 22 through March 21 – came to a more hopeful conclusion. “The data so far clearly shows that the number of cases for temperatures greater than 17°C (63°F) and absolute humidity less than 9 g/m3 (about 60% relative humidity) is low,” meaning that the virus was not spreading as rapidly in warm and humid climates.
Absolute humidity tells us how much actual water vapor is in the air, and this is a key factor in virus transmission, according to the MIT study. Drier climates tend to evaporate the layer of moisture that surrounds a virus when it is expelled by a cough or sneeze. A humid environment would prevent that layer of moisture from evaporating, further preventing exposure.