That's what probably happened. And I can also assume that Rushdi never tried to claim there "I am the real Rushdi", only tried to show that "My name is Salman R

That's what probably happened. And I can also assume that Rushdi never tried to claim there "I am the real Rushdi", only tried to show that "My name is Salman Rushdi [too], see my passport, therefore I should be allowed to use this name". While FB was trying to protect that name for the real Rushdi. If FB employees really knew this is the real Salman Rushdi they are talking with, this probably would have never happened.