Corrected entry: In the episode, because the Doctor was not around as he was killed in the alternate reality, all the present day invasions that he stopped in the normal reality happened. However, since his death was before many invasions in later seasons in the normal reality that were chronologically before his death (for example, The Carrionite invasion in 1599) the Earth should be already destroyed. Therefore, he couldn't die on Earth, so it would be a paradox that would erase his timeline.
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