It means there is no evidence that leads to the building of the theory, and therefore is not question of being false and or true. It just means that the theory is weak or nonexistent. From there on one could say that theory is unattainable. Depending upon your views one then might think it’s false or at least not yet proven.

The criticism at metaphysical ideas is that they pretend to know/see things that are beyond possible experience and are therefore impossible to prove with experiment’s because they are not visible.

From there on one could conclude that metaphysical thinking is delusional by definition.

On a more personal note I have had experiences where I have met god during some of my trips. These experiences, as someone who very firmly not believes in god, I hold as some of the most impressive and life changing experiences.