There are several possibilities in this, if you have any doubts about @simantobd, about the original ownership.

• If @simantobd, has another Alt account, participates in the Bounty using the same Twitter and Facebook, it is possible that the original owner of the account is controlled by: @simantobd.
• if @simantobd's account is sold or hacked, it's possible that the way he posts can change and vice versa Twitter and Facebook are replaced by the buyer.

This reason can be proven from Twitter and Facebook which are still used by the Alt account @simantobd.
Proof:
https://bitcointalk.org/index.php?topic=3279397.msg38684339#msg38684339

I think the @simantobd account is still controlled by the original owner, namely: @simantobd.