They hold a weird cognitive superposition that it its a conspiracy theory because nobody is secretly orchestrating the replacement of white people (in their view) it's just the natural evolution of humanity.

Its the same way that they'll say "if gender roles are natural why do they require so much propaganda to enforce?" They lack the ability to recognize the propaganda that has programed them to reject those norms.

Thus in their view, they don't recognize whites as a set of humanity with rights, so they cant be "replaced" any more than a gazelle can be murdered by a lion.