That doesn't make sense to me.
Given that one surface of the moon constantly faces Earth,” that the Earth rotates on an axis that “wobbles” (is not in sync with the sun), and that the combined Earth-moon mass cycles around the sun in an elliptic orbit; there's no way that any part of the moon is in perpetual darkness.
We shall see
Picture a crater as a ring-shaped mountain range. While it’s true that the precession (wobbling) of the moon tilts these polar craters into and out of the shade, the light only ever hits the peaks of the mountains; the deep “valley” of the crater below remains in their shadows.