Non-moment is not a convincing thought. Moment is always, it is always the past, always the present. Non-moment created by the cancer, or the effect of the cancer, is not real, the only non-moment is in the future, which will become moment as soon as time catches up with it.

But if the soul is being eaten away, then maybe non-moment can exist as a concept, the altered moment?

Non-moment as a description tool or concept to describe an event that may or may not be happening. Non-moment is not the event; it is the term to describe it.

Moment is the only event.