Awhile back, enlisted personnel used to be able to become aviators. They would receive silver wings instead of gold. This was a long time ago though...
I'm not sure where you got your information. The last Navy enlisted pilot was ACCM Robert "NAP" Jones. His son was in my company at boat school. He visited several times prior to his retirement in 1981 and was a well respected pilot. He wore Naval Aviator gold wings, no different.
As for the controversy over this picture, the wings are gold and between wear and camera lighting they just appear silver.