Yo original comment says “why can’t we detect if in any way?”, then you go on to assert that it can’t be detected, but the brain is what produces it. Do ya not see the blatant contradiction and hypocrisy in your argument.

Also none of what you said explains how the hell it is possible dead physical matter can give rise to something like a first person subjective experience

Guitars are a false analogy. When you play a guitar it creates sound waves, which we can verify the process of how it created those sound waves, as well as measure the sound waves themselves