Tweet by the Mayor of Bengaluru and article published by Deccan Herald support this claim.
Mayor Goutham Kumar said that BBMP's aim is to prevent the outbreak of COVID-19 in all 198 wards in the city, and BBMP workers have sprayed sodium hypochlorite solution as a disinfectant around public places in the interest of public health and safety. Furthermore, according to one of the BBMP officials, they have hired drones to spray disinfectant solutions across the city.
It was also reported that a group of Engineers developed a 6 hexacopter drone that can cover an area of about 6 m/s and can carry 15 litres of disinfectant. The drones were used to disinfect places like markets, bus stands, and railway stations.
The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19 including symptoms, prevention and available treatment, please refer to the World Health Organisation or your national healthcare authority.