I don't understand how this account can even be active in forum when he is doing ban evasion for years... so wearing a signature or not is much less problem in this case.
It was proven since 2019 by coinlocket$ that farhansadik, Nilima-Temp, btcboss71, SAKHAIR, cryptosabbir120, rifatfor are all connected, and two of this account are banned while others are inactive.
More details about his accounts can be seen here:
https://bitcointalk.org/index.php?topic=2544574.msg50410794#msg50410794