Lindy, there are Cargo Cult people building wooden models of airplanes on tropical islands who know more about avionics and guidance than the guys who wrote that article.

A gyro chip is for sensing the attitude of an airplane, and in this case it feeds into the instruments the pilot is looking at (artificial horizon). It can be used in any aircraft--or any application where you need to know the attitude of a system. It does not "turn a plane into a remotely guided missile."

When I was doing avionics work, off-the-shelf plane gyros were still mostly actual spinning units, although laser and other solid-state devices were coming into the picture.