We’ve traveled this road in previous threads. The references to death are many. But, typically, they are not explicit that she experienced death - whatever that might mean, given her incorruption and assumption.
Christ too then, whose body did not suffer incorruption and who on the fortieth day ascended into the heavens must then be said not to have died, following this logic. Of course, that then would result in the dissolution of the entire Christian religion, so I suppose we should admit that the Virgin did in fact die, lest we should conclude that death of her Son was not real. For his body, like hers, did not experience corruption.
Nothing like: “she suffered, died, and was buried”. Instead they focus on the triumph over death: “death could not hold”, “virgin after childbearing, and alive after death”…
At the same time, “deathless dormition” is verbatim.
The texts are quite explicit that what she experienced was death.
See for example, these troparia from the canons of matins on the day of the Dormition:
Death has become for you, pure Virgin, a crossing to an eternal and better life, translating you from one which perishes to one which is truly divine and without change, to gaze in joy upon your Son and Lord.
Once the sacred enclosure of life, you have found eternal life; for through death you, who gave birth to life in person, have passed over to life.
In you, O Virgin without spot, the bounds of nature have been overcome; for childbirth remains virgin, and death is betrothed to life; Virgin after bearing child, and alive after death, O Mother of God, may you ever save your inheritance.
The impermanence of the condition (that is, of her death) does not make the condition any less real (otherwise, we should have to think that Christ’s death too was not real). The major theme of the festal texts is that by death, she found herself joined to her Son, the Christ, turning death into a passage into eternal life. The texts referring to her deathless Dormition, being alive after death, etc., are not meant to deny the reality of her death, but only to emphasize its strange and unusual character (that is, that she was resurrected and assumed), and furthermore to show us that death through the sacrifice of Christ is now the passage into eternal life.
I think his perception that death and resurrection are intimately connected is spot on. Indeed, the idea of bodily death as a form of passing over into eternal life, as a form of putting off mortality to gain immortality, is a major theme in a major patristic thought concerning the Dormition. See for example, these excerpts from St. John of Damascus’ three homilies on the Dormition.
O how does the source of life pass through death to life? O how can she obey the law of nature, who, in conceiving, surpasses the boundaries of nature? How is her spotless body made subject to death? In order to be clothed with immortality she must first put off mortality, since the Lord of nature did not reject the penalty of death. She dies according to the flesh, destroys death by death, and through corruption gains incorruption, and makes her death the source of resurrection. (from the first homily)
For how could she, who brought life to all, be under the dominion of death ? But she obeys the law of her own Son, and inherits this chastisement as a daughter of the first Adam, since her Son, who is the life, did not refuse it. As the Mother of the living God, she goes through death to Him. (from the second homily)
Then Adam and Eve, our first parents, opened their lips to exclaim, "Thou blessed daughter of ours, who hast removed the penalty of our disobedience! Thou, inheriting from us a mortal body, hast won us immortality. Thou, taking thy being from us, hast given us back the being in grace. Thou hast conquered pain and loosened the bondage of death. Thou hast restored us to our former state. We had shut the door of paradise; thou didst find entrance to the tree of life. Through us sorrow came out of good; through thee good from sorrow. How canst thou who art all fair taste of death ? Thou art the gate of life and the ladder to heaven. Death is become the passage to immortality. (another from the second)
To-day the living ladder, through whom the Most High descended and was seen on earth, and conversed with men, was assumed into heaven by death. (from the third homily)
Be glad, O divine apostles, the chosen ones of God’s flock, who seem to reach the highest visions, as lofty mountain tops. And you God’s sheep, and His holy people, the flock of the Church, who look to the high mountains of perfection, be sad, for the fountain of life, God’s Mother, is dead. It was necessary that what was made of earth should return to earth, and thus be assumed to heaven. It was fitting that the earthly tenement should be cast off, as gold is purified, so that the flesh in death might become pure and immortal, and rise in shining immortality from the tomb. (another from the third homily)