I also wonder where from this knowledge comes from
Though even I sometimes get inights and just know something. Probably the more mind is open and maybe chakras the more the knowledge just have place to become or we all can be aware of some truths but only few of us want or are able. But anyway, I also wonder why some people has such a big knowledge.
As to your question, I think that nothing spiritual should be taken literally. For me, idea of Twin Flame and shared chakras (even though I had an experience of shared chakras with my "tf"!) or splitted soul made a bit damagages. I should treat everything symbolically as I am a bit schizophrenic and can sink into ideas. But if someone is rather earthbound or sceptical maybe should see these more literall. I hope this helpes.