>It's a turn of phrase that's emphatic about the felt quality of qualitative experience. And in I think it's quite a good one, because in English it has just the right amount of cross-sections of connotation that it brings out this being felt quality that everyone reading it seems to understand.

I think you hit the nail on the head here. It's an effective way to codify a metaphysical intuition held by many people. That it would in any way constitute a proof for this intuition of course does not follow at all.