These three are experienced because of Turya. That's what Turya does for these three. They manifest Turya, but the difference is this: These three depend on Turya for their existence. But it exists even without them. Even without them, yes. We can only experience that through these, because that's who our experience is.
Swami Sarvapriyananda teaches one of the shortest and most profound upanishads accompanied by Gaudapada's Karika. This lecture covers Mantra 7 (Part 2).