The Apostle Paul is still talking about immortality. He had said that he did not want to die, he just wanted to put on his Light and Glory which he knew belonged to him since his trip into the heavens. He knew however that if his physical body did wear out that he had a Celestial house in the planes of Spirit. It was eternal and consisted of Light.
Thus the Apostle Paul said he did not want to die, but he did want to get into that Light. Just wanted that Light to envelope his physical body so that this mortal will be swallowed up with immortality and live forever. This means, restored to immortality.
This is why the Apostle Paul talked about the fact that there is only one thing we wait for which is the redemption of our bodies. We already have Eternal Life, we are living souls assured of Eternal Life. We are waiting to see Death stopped, for mortal to put on immortality.
This process is already at work in us, and at the time YAHSHUA returns, it has not only been promised but has been generally accepted by the whole structure of Christianity that no area of interpretation or mistranslation could make you miss this, that there will be a perpetual immortality. That you are in the image of YAHWEH, you are spirit, soul, and body and you will become indestructible. That you will no longer die, no longer will your physical body be subject to death.