Satan is only "loosed" at the end of Christ's earthly rule.
His feet will have actually touched the Mt. of Olives at the beginning of His earthly rule as he then crosses the brook Kidron and enters Jerusalem through the Eastern gate,
All of this happening many, many years before " Satan is Loosed "
You are confused about Jesus's FIRST coming to reign on earth , and then many, many years later Jesus's settling all accounts in the battlefield of Megiddo .
Two very individual events.
Yes ? No ?
There is in God's Word a prophesy that mentions both individual events , Jesus's rule from Mt. Zion , FOLLOWED by Jesus's rath against the forces rallied against Him.
Please not the order in which these events occur, earthly rule followed by earthly rath.
Yet have I set my king upon my holy hill of Zion.
Psa 2:7
Psa 2:8
Ask of me, and I shall give thee the heathen for thine inheritance, and the uttermost parts of the earth for thy possession.
Psa 2:9
Thou shalt break them with a rod of iron; thou shalt dash them in pieces like a potter's vessel.