Premise: But one thing is essential, I must see the girl."

Hypothesis: I will do anything to see the girl.
Answer: it is not possible to tell

Premise: Thus, even if GAO were able to identify certain deficiencies in a land management plan, for example, GAO would be prohibited from examining the process used to develop the plan in order to suggest improvements.

Hypothesis: Thus, if the GAO were not able to identify deficiencies in the land management plant, for example GAO would be prohibited from examining the process used to develop the plan in order to suggest improvements.
Answer: no

Premise: But if he expects to have any credibility, he should understand the difference between the two versions.

Hypothesis: The two versions are different and everyone credible knows this.
Answer: yes

Premise: 3 raises the question of what else in his book is fictional.

Hypothesis: it wasn't important which parts of their book was fictional or non-fictional.
Answer: it is not possible to tell