This is called forms, and forms aren't "real". If you slap a label on something it doesn't make it real. For example, a chair is just a bunch of wood, plastic, or metal, organized in a certain way. Furthermore, that wood is also a form in and of itself, as it is made of carbon. Likewise, everything is made of the 5 aggregates. The labels and stories you apply to forms doesn't make them real. A human being is made of water, earth, heat (fire), air, space, and consciousness, everything beyond that is fabricated.
Likewise, the Atman is a fabricated story that is not possible. Lastly, even forms are impermanent.
Yes because something that does not exist cannot have conditions. If something ceases to exist without remainder (aka not just forms), then there will be conditions up until the point where there are no more conditions.
It applies to everything. There is no magical voodoo in the universe that super-secedes the laws of physics and nature.
Nibbana means there is no birth in the first place, no conditions in the first place, so there is nothing to be sensed in the first place. There are only conditions leading up to non-existence, but afterwards there are none.
And? That doesn't negate the fact that all proof must have a sensory representation, even though it's not available directly to a human, like say far-infrared light or ultra-violet light. All evidence must be sensual or perceptible, otherwise there is no evidence to refer to.Also being aware of something doesn't prove it doesn't exist
Unless you're misusing the term "prove", there's a difference between proving something as true (thus requiring consistent and reproducible evidence) and postulating something as true (showing something is true through logic and reason).