Adam was told , if you sin you will die. That does not describe immortality.
Agreed. God alone is immortal.
1 Timothy 6:15-16 "1which God will bring about in his own time—God, the blessed and only Ruler, the King of kings and Lord of lords, who alone is immortal and who lives in unapproachable light, whom no one has seen or can see. To him be honor and might forever. Amen."
People should study their scripture more. It was implied that Adam would not die if he did not eat of the fruit. It was also clearly stated that if he was allowed access to the Tree of Life he would not die, in spite of his sin. However, both situations are conditional, and do not represent true immortality.