Look at an angel Moroni in the sunlight. Here is one:
Notice that the whole angel does not shine at the same time? Pilots are more likely to get a glare from a solid flat reflective sheet like a window or a car windshield. Or the windows on the temple spire:
Notice that the windows put out WAY more reflection than the Statue? You are not likely to get much of a glare from the Moroni as the surface of it is not flat. The uneven surface of a Moroni is going to reflect small amounts of light every direction, but the part that will usually reflect the most light is the flattest portion of the statue: the front and back. As the front and back are mostly vertical and as the sun is above that vertical surface, it will typically reflect more light the opposite direction from the sun, down to the ground. In the photo top, I was standing at the point of maximum reflection from the sun: below the Angel on the ground.
An incoming airplane is ABOVE the statue, between the statue and the sun. Not much light is going to bounce backwards up towards the sun. This is just not that big of a concern.
“How High Up Is A Plane 20 Miles From Touchdown?” airliners.net