TTP or any other Islamic militant group will never attack a non muslim country as it attracts a lot of heat. They target Muslim countries where they can get away with their crap shoveling lies and antics.If it is fake, then it is even more sinister. It means the TTP have decided to expand their operations into India after being expelled from their location. Perhaps via the Sea, or posing as Afghans they intend to flood India for terror activities.
However India is a big place with a very large Muslim community. It look takes a few thounsand desperate poor Indian Muslims to be corrupted for things to start blowing up.