What this is not

I find Nafisi's statement at the beginning of chapter 10 about how to relate her story to Lolita intriguing. She writes, "I want to emphasize once more that we were not Lolita, the Ayatollah was not Humbert and this republic was not what Humbert called his princedom by the sea" (35).
I find this statement particularly interesting because she is so adamant about it. It seems logical to relate Nabokov's story to this memoir in this way. Why should Nafisi feel so strongly that this not occur? It seems counterintuitive for an author to tell their reader that they should not read a text in one specific, and especially obvious, way.