This is a poetic description of shikantaza or “Just sitting”. It can't be deconstructed, only suggested poetically, and practised in a leap. . This Zen Buddhist way ain't everyone's cup of tea, and it is no better or worse than any other. If this description rings a bell, it does. If it doesn't, it doesn't. Either way, no problem.
Shikantaza can to a certain extent be described as choiceless awareness. But that is just a pointer, because the teaching setting in which Shiknataza is practised, is non-gradual, and declares the innate self-resonant perfection “as such” of body, mind, and world. Yet, having established this view of “nothing to attain”, this view dropped in practice along with all view. So, in “Just Sitting”, there is no watching of thoughts and feelings arising and passing, no contemplation of impermanence, anatman, or Dukkha. There is no watching of any kind. There is “just sitting” as is, whole and complete, with no notion of it being whole and complete. There is no self, yet this no-self is forgotten, and the forgetting is forgotten. In forgetting forgetting, there is returning to ordinary just sitting, floor is floor, hands are hands, thoughts are thoughts, all ordinary, all “alone”, including ordinary self. Simple.
Descriptions of this "simple" using ontological absolutes are dead wrong here. Even using Skillful Means like "True Nature" are deeply fishy. But it is fair to describe it as cessation of Dukkha.
Hi mods sorry for no avatar. I'm too dumb to find an upload option on the dashboard.