It's literally like this:
Materialists/Physicalists: "The thoughts in your head come from your conditions and are ultimately the result of your organs and nervous system. Your consciousness is linked to your brain activity and other parts of your body interacting with the physical real world."
Dualists: "Ok but what if there were an imaginary zombie that has the same organs and molecular structure as a living person but somehow isn't alive on some metaphysical level. If this zombie is conceivable, that means it must be metaphysically true somehow."
Materialists: "That's circular and imaginary, isn't it?"
Other dualists: "Ok but what if I were in a swamp and lightning strikes a tree and magically creates a copy of me but it's not actually me because it doesn't have my soul."
Am I reading this stuff wrong or are these actually the best arguments for mind-body dualism
You're saying it perfectly. I don't know why I'm offering even a little respect to these premises they came up with. I was told they were the best things dualists have, and they are just magical fantasy scenarios. And yet philosophers like David Chalmers and John Searle are considered geniuses in their field. How do these people have careers if their entire philosophy boils down to belief in literal otherworldly magic?