I don't see why @amirm or any moderator (who says that a moderator needs technical knowledge, btw?) would step in. You are the only person here completely confusing a fully differential amplifier with differential inputs. You can have the latter without the former, no problem. And the benefit of common mode rejection is absolutely retained in the latter case.I think that the intervention of a moderator who has technical knowledge should intervene in which case Amir himself since it is obvious that he knows his subject well.
I would like to thank in advance the staff of the forum whose intervention will allow readers to read the right information.
Accept my sincere greetings.
If on the XLR inputs pin 3 was disconnected or (more likely) connected to ground, this would be an unbalanced or - if you like - "fake" balanced input.
If the differential signal on pins 2 and 3 is properly converted into a single ended signal by a symmetrical buffer stage, the input is no doubt a balanced input.
Think about it for a minute.