Neuroscience denialism is fascinating to me. It flies under the radar because we mostly hear about global warming denial, evolution denial or flat earther denial. But we have mountains of evidence of wakeful mental states being tied to measurable effects.

Facial recognition is specific to a particular brain region, clearly tied to a mental event sufficient for working definition of a form of conscious activity, and only active when someone is conscious and picturing or imaging a face. Remarkably, damage to the area responsible for facial recognition can predict faceblindness. That is more than enough for a working definition of conscious activity, and that's just one example from mountains of them.

Others include everything from wakefulness under anesthesia (which can be tested for and predicted based on EEGs), as well as which brain activity distinguish locked-in syndrome from persistent vegetative states. Not to mention mountains of evidence for how physical circumstances predict mental states, everything from psychedelics to iron deficiency.

You can always retreat to the claim that nothing short of direct access to another's subjectivity "counts" but that's not how science works. We don't directly see dark matter either (or electrons or neutrons or magnetic fields etc), we see its effects and build theories around them.