That verse is not about Satan. That verse is about the King of Tyre as indicated by verse 12. Tyre was an ancient very famous and a very wealthy city in the ancient world. It would be in what is today presently Lebanon, so very close to Israel. The Bible and other historical records indicate the Tyrians were mostly merchants made very wealthy mostly for their product known as Tyrian Purple, a very very rare dye in the ancient world favored by the nobility of many different kingdoms. The Tyrians were racially Canaanites, specifically of the course of Sidon (son of Canaan, and also a city-state in its own right later on.) Sidon is also mentioned in this prophecy by Ezekiel in this chapter and the next few chapters.
The ultimate fate of Tyre was that the king of Babylon, Nebuchadnezzar, destroyed the land settlement of Tyre, but the Tyrians created a Tyre in the middle of the sea which escaped destruction (this is both in secular history as well as a prophecy the biblical book of Zechariah). In accordance to the prophecies, the Tyre in the sea would not escape destruction and the third beast king Alexander would eventually build a causeway to the Tyre in the sea and ultimately destroy it.
Eph 2:2
Wherein in time past ye walked according to the course of this world, according to the prince of the power of the air, the spirit that now worketh in the children of disobedience:
He's called a prince because he's the temporary ruler of this world 2 Cor 4:4. And possesses power to manifest evil in this world influencing people & also commands an army of fallen angels/demons. These beings influence earthly rulers/governments.
Daniels vision in chapter 10. He's on a 24 day fast seeking God. When an angelic being shows up
12 Then said he unto me, Fear not, Daniel: for from the first day that thou didst set thine heart to understand, and to chasten thyself before thy God, thy words were heard, and I am come for thy words.
13 But the prince of the kingdom of Persia withstood me one and twenty days:
(NOTE: This isn't one of King Cyrus sons that withstands Gods sent angel for 21 days)
Eze 28:
12 Son of man, take up a lamentation upon the king of Tyrus, and say unto him, Thus saith the Lord GOD; Thou sealest up the sum, full of wisdom, and perfect in beauty.
13 Thou hast been in Eden the garden of God; every precious stone was thy covering, the sardius, topaz, and the diamond, the beryl, the onyx, and the jasper, the sapphire, the emerald, and the carbuncle, and gold: the workmanship of thy tabrets and of thy pipes was prepared in thee in the day that thou wast created.
(NOTE: Was in the garden of Eden. Tabrets of thy pipes = sockets and grooves used as the settings for the precious stones. Created NOT born)
14 Thou art the anointed cherub that covereth; and I have set thee so: thou wast upon the holy mountain of God; thou hast walked up and down in the midst of the stones of fire.
15 Thou wast perfect in thy ways from the day that thou wast created, till iniquity was found in thee.
How could he have been in Eden? He's called an anointed cherub the was upon Gods Holy mountain (Tyrus isn't on God's Holy Mt) that was perfect in beauty & in thy ways. Hebrew Tabrets = sockets & grooves used as the settings for the precious stones. And created NOT born! Do you really think this king of Tyrus mentioned here is flesh?