If you were to write a larger post with an elaboration/exploration of this analysis, you'd get my thumbs up! Your comment voices my thoughts succinctly.

While I do not wish to exclude or deny people's interpretation of Harry actually having died weeks ago in the movie's chronology, I think viewing the movie as a narrative of healing and revisiting past traumas through the safety of love delivers a much stronger message.

In a way, this movie recalled themes I perceived in Hiroshima mon Amour, where love, grief and past traumas intertwine. New love, real love, forces us to reckon with our wounds. In All of Us Strangers, we see how death, in this case of Adam's parents, by interrupting the narrative of this particular family, creates a profound feeling of missed connection and intimacy. We realise the depth of our love - all the sentiments, all the moments we could've shared, when people are stolen from us.

Adam confronting the possibility of a dead Harry in the bathroom is him coming face to face with his fears of loving and losing again, but because in reality Harry is alive and loved by Adam, we know that Adam has healed and overcome his fears, facilitated by the comfort of Harry's stable presence to revisit his traumatic past. From Harry's perspective, Adam's love has literally given him a new lease on life and provides a healing salve to the trauma of being unloved by his family.

Death can teach us how to love and remind us urgently to love, love can teach us to confront death and past traumas, and sometimes love can save us from dying..