In Jn 8:44, Yeshua the Messiah says the devil was a murderer & a liar from the beginning, therefore Ezek 28:15 can’t be talking about satan.
John 8:44 Ye are of your father the devil [false accuser], and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him.
Ezekiel 28:15 Thou wast perfect in thy ways from the day that thou wast created, till iniquity was found in thee.
The truth is, satan is not a fallen angel, none of the angels (celestial beings) sinned, Ezekiel 28:13-17 is talking about a man, the king of Tyrus, not a fallen angel.