Its different from political poll because it is not random. Its like looking at internet usage pattern of Indian internet users and predicting the traffic of Reddit, when most of the traffic of reddit comes from USA/EU/Canada.
And that's exactly whats happening, Alexa relies on people who install Alexa toolbar and from what I remember reading most of Alexa users are from South-east asia, or more precisely, from India.
This is so dubious, its not even funny.