Appendix A which you mentioned does discuss lexiles, including "legitimate questions can be raised about the tools used to measure text complexity... ", for example:
some widely used quantitative measures, including the Flesch-Kincaid Grade Level test and the Lexile Framework for Reading, rate the Pulitzer Prize–winning novel Grapes of Wrath as appropriate for grades 2–3. This counterintuitive result emerges because works such as Grapes often express complex ideas in relatively commonplace language (familiar words and simple syntax), especially in the form of dialogue that mimics everyday speech.
In comparing the charts in both documents, the ranges do not match. Example:
- Appendix A: grades 2-3 band, "Lexile ranges aligned to CCR expectations" 450-790
- Lexile document: grades 2-3, "2012 CCSS Text Measures" 420-820
Appendix A does not seem to link to or reference the lexile webpage as a resource.