India is a Southern country. The sun is at a higher angle there. That is what makes the environment inhospitable to the Virus. People expose more skin to the rays of the sun. In more northerly climes people cover up and the sun is at a less effective angle until the summer. Think about it. The virus does quite well in a 98.6 degree environment.
You are 100% right. The dark brown skinned Indians are living proof of a hot and sunny climate. People living in Mumbai don’t need to own a simple sweater or warm jacket!