Let it be known

Today, with inflation rocketing and fuel bills set to jump in April, Sunak’s national insurance rise is deeply contentious. His likely leadership rival Liz Truss let it be known that she had challenged it in cabinet at the time, and the leader of the Commons, Jacob Rees-Mogg, has called for it to be cancelled.

Is the "it" in let it be known a raised object in the second sentence of the passage above?