I spent a minute looking at that too. I think the author inserted the [sic] because: "quotes [...] with 1–2 sentence analyses of its [sic] significance"

I spent a minute looking at that too. I think the author inserted the [sic] because: "quotes [...] with 1–2 sentence analyses of its [sic] significance" If the "its" is referring to the quotes, it should be "their significance".