there are a few places in Revelation that show flat earthism, when the Jewish Messiah (not Jesus in the original version) appears in the sky, everyone on earth can see him; not possible in a spherical earth, which shows the beliefs of the writer. The gospel of Matthew is also flat earthist.. when Jesus is taken up to a very high mountain by the devil, he is shown ALL the kingdoms of the earth, again not possible for a spherical earth.
He indeed comes from the east -like lightning; and every eye indeed sees Him, Like Lightning, circling the earth as He descends upon Mount Sinai, where the angels gather the Jews to, from all over the earth, to stand before Him as their Messiah/King/Firstborn Son of God/ the Mighty God/ The God of the whole earth -
to be passed under His Rod and judged as to their worthyness to enter into the promised Land or to be rejects and cast alive into the Lake of Fire [Ezekiel 20:33-44].
The high mountain is not on earth below, which the devil took Jesus up to, and is explained in Enoch the prophet's writings as a seat of power of the principalities and powers over the earth; and those mountains are the "mountains that shall melt like wax", at the coming of the LORD Jesus Christ, to reign over His ransomed kingdom.
As to seeing all the kingdoms of the earth, you left out the rest; "in a moment/a stick, of time".
So Jesus has a supernatural taking up to a supernatural mountain in the supernatural realm of heaven over earth, and sees supernaturally, the supernatural realm of the kingdoms of the world.
It doesn't pass the test of making a flat earth, which is already declared to be a globe, in the Torah and writings and prophets -and by all history of all the world.
The king of Tyre in Isaiah traded grain grown by the Nile River to the western continents, and to all the nations of the whole world, by sea.
At the time of that prophecy in Isaiah, the nations in the western continents were thriving. The Olmec civilization of what is called Mexico, today, was in the height of their glory when Nebuchadnezzar ruled over them
, as the king of the kings of the whole earth, ruling from Babylon.
God brought them down [Psalm 9], and the evidences of their great civilizations and the trading and exchanges of men and goods from all the globe still exist.
The tombs of Egypt have traces of cocaine from South America, in mummys.
Corn and pineapples are found depicted on ancient Egyptian relief work in tombs, which got to Egypt from the trading with the western continents through the merchantmen of Tyre, who were the great sea-faring Phoenicians.