I had noticed that long ago and had asked him directly about that. He denied to be an Indian and said that he posted there because there was only one board for sub continent or something like that.
He is fluent in Bengali because he is from Kolkata, India. You know Bengali is also used in Kolkata. When I asked about this, he denied and said he had business in India and that's why he had to go in India but he had reserved a spot here- https://bitcointalk.org/index.php?topic=330628.msg3838986#msg3838986

It's possible that the account changed hands but for your info, the Bengali thread for Bangladeshi user which BitcoinDream is moderating has been created in 2014- https://bitcointalk.org/index.php?topic=631891.0
While the bitcoin address which newIndia used in 2014, have been found in BitcoinDream's profile in 2015. Doesn't this prove that the account is still in the hand of same owner as it was at the time of creating the thread?

Please Note: A thread on reputation doesn't necessarily always for a negative tag. It's about someone's reputation, cheating on forum users, abusing the forum system (which still is under shadow).
@coolcryptovator, if you need to tag him, his signature campaign abusing is enough. Others thing here proves BitcoinDream aka newIndia is a dishonest person, impersonating to be a Bangladeshi.

@Johny Depp, grateful to you. I'm looking for that thread.