The article mentions using ML to analyze and detect anomalies on the moon. Evidently there are a pair of very interesting anomalous shapes on the far side of the moon found in the Apollo footage
You can see the place here https://quickmap.lroc.asu.edu/layers?extent=-91.9051678,-17....
The "passageway" is only revealed when two images with opposing sun directions are superimposed. When those images are combined it leaves a shadow in the middle.