I was reading the "Paradise Restored" book, of 1974 and one of the last chapters explains in detaile this prophecy just as this The Watchtower Issue does, but more detailed, so, I'm not sure if this article really contains a "new understanding" of Zachariah 14.
Bengifunda incwadi ethi "Paradise Restored," yango-1974 futhi esinye sezahluko zokugcina sichaza ngokuningiliziwe lesi siprofetho njengoba kwenza le Nqabayokulinda, kodwa inemininingwane eminingi, ngakho-ke angiqiniseki ukuthi ngabe le ndatshana iqukethe ukuqonda "kukaZakariya 14.