1: to have the often specious appearance of being, intending, or claiming (something implied or inferred) <a book that purports to be an objective analysis>; also : claim <foreign novels which he purports to have translated — Mary McCarthy>
[M-W's Col. Dic.]

The underlined part is not being used as an example and neither does it add any additional meaning. So what is the purpose of using it, after all?
It is allowing the reader of the dictionary to insert whatever it is that is implied or inferred - in the example it is "an objective analysis".
Thank you, Feebs.