2: The relationship between perception and reality is the subject of the next paragraphs, the first two of chapter 4: “We find that we learn according to this that our perception is itself the reality of the world for us. … This perspective seems strange to us, but it is only because we live in olam ha’asiyah and see the physical as literally (mamash) absolute…” (Note: The Hebrew actually borrows the word “absolute” throughout the essay.)
This is pretty clearly a phenomenologist position. (Phenomenology: A philosophy based on the intuitive experience of phenomena, and on the premise that reality consists of objects and events as consciously perceived by human beings.)
3: Rav Dessler himself extends the inability to experience miracles with the inability to experience their legacy. This is why we compute the molad from a point in the creation year, without accounting for the month that took fewer days because one of them was extended when the sun stood still for Yehoshua.