First, Mt Zion is not Mt Sion.
Deu 4:48
From Aroer, which is by the bank of the river Arnon, even unto mount Sion, which is Hermon,
This is the only place in the OT Script speaking of Mt Sion, which is at Hermon. Therefore, Mt Sion is not Mt Zion, which is at Jerusalem. Neither is Mt Sion...