The answer is: Mr. Kurland bases his fundamental and comparison of both different kinds of readers mentioned, in the analysis.
Kurland compares the critical reader to the non-critical reader based on the analysis of the read text. While the non-critical reader is not concerned with whether that text is only a version of what is true, the critical reader performs this analysis. The non-critical reader is concerned with understanding the idea of the text, it does not bother to analyze. The non-critical reader reads the text with no concerns about information, language usage or values. This is linear reading activity. The critical reader performs a diferent readig activity, which is analytic.