Matt 16:23 Jesus turned and said to Peter, "Get behind me, Satan (Satana)! You are a stumbling block to me; you do not have in mind the things of God, but the things of men." Satana
Definition: an adversary, Satan.
Now lets look at what other word Jesus could have used.
Antidikos
Short Definition: an opponent, adversary
But he didnt use a different word for adversary or any other word He could have used to indicate what He meant. He used the same word He used when addressing Satan himself.
Matthew 4:10 Jesus said to him, "Away from me, Satan (Satana)! For it is written: 'Worship the Lord your God, and serve him only.
Interesting that!
So is it your contention that the conversation was not only recorded in Greek 30+ years after it occurred but actually took place in Greek?
Satana, Satan, derives from the Aramaic root sata, and means to slip, to slide, to deceive, to miss the mark, and to cause one to be misled or go astray. In Aramaic, calling an individual a satan means that the person is going astray or misleads. To use your reasoning, if Jesus had intended to refer to St. Peter as the devil the words he could have used were Lucifer, Beelzebub, Ahriman, Mephistopheles, or Phosphoros.
Peace be with you