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
It reminds me of Pascal's wager, an argument that is obviously heavily flawed unless you already accept, uncritically, the assertion being argued. That's why I believe motivated reasoning is at work here, these arguments won't convince the critical, but they do allow believers to convince themselves that their otherwise baseless beliefs are actually well reasoned.
This isn't to say I think dualism is wrong, but more to say that it is non-falsifiable and not well supported by existing evidence.