It means that metaphysical realities like 'God' or the transcendent are not something that are subject to theory or experimentation. It does not therfore hold that such views regarding them can necessarily be dismissed, but rather that they are beyond the range of testable hypothesis from a material sciences perspective, and such methodology does not apply.

Not true. They are very much within the range of direct personal experience, but they cannot be externally verified by some kind of machinery or experimentation. They can however be corroborated by individuals across their collective experiences, and some kind of consensus may be arrived at.

The idea of trying to reduce everything, especially human subjectivity to a simplistic experimentation and hypothesis model is a reductive and limited materialist obsession.

It seems there is a dissonance then between what you 'believe' in your formulation of views, and what you have directly experienced and known. Reconciling these two would be then the challenge.