Exactly, we cannot know everything, and that applies to Eckhart Tolle as well. When I say something is nonsense, it is my way of saying it doesn't fit into my perception of reality. It's just a more direct way of saying the same thing.

Reality may indeed not be what we think it is. It might be what Eckhart Tolle thinks it is either. Or what Plato or Plotinus thinks it is.

These people make statements about their perceptions of reality. I'm making statements about my perception of reality. It's all the same thing.