“If he doesn’t care about clones, even if he knows that some version(s) of him are the clone, then he just presses the button, right?”—No, because if it turns out that he is actually a clone, he will be tortured.
“Or are you saying that only the cloned versions of him care about the clones?”—Yes, Dr Evil only cares about Dr Evil, Dr Evil Clone #1 only cares about Dr Evil Clone #1, Dr Evil Clone #2 only cares about Dr Evil Clone #2 ect. Why isn’t that coherent?
“So his clones _are_ definitely him”—Why? The clones could have completely different backstories from the original Dr Evil, just so long that they (the clones themselves) can’t tell. That suffices to create the desired ambiguity.
“If he doesn’t care about clones, even if he knows that some version(s) of him are the clone, then he just presses the button, right?”—No, because if it turns out that he is actually a clone, he will be tortured.
“Or are you saying that only the cloned versions of him care about the clones?”—Yes, Dr Evil only cares about Dr Evil, Dr Evil Clone #1 only cares about Dr Evil Clone #1, Dr Evil Clone #2 only cares about Dr Evil Clone #2 ect. Why isn’t that coherent?
“So his clones _are_ definitely him”—Why? The clones could have completely different backstories from the original Dr Evil, just so long that they (the clones themselves) can’t tell. That suffices to create the desired ambiguity.