If you learn meditation. You start to realize where your thoughts come from. You start to realize many thoughts come from you from outside yourself. It is very apparent that consciousness is not in the mind.

If you learn astral projection, it is even more apparent that your consciousness is with you, some place other than your body. As in, you are here. And, your body is not.

Further, you can get more spiritual, and get more in touch with the part of you that is not your body. Basically, you will find that you are a spiritual being having a physical experience, not a physical being having a spiritual experience.

To me, this is just statements of experience.

Now, on Orch-Or, they could kinda be correct. The brain is an antenna. It collects information from a lot of waveforms that are our actual world, and then displays to our aware mind the 3D world. That the brain is an antenna is well known, how it works needs much more study.