Hello. You did not say, what text you are referring to, which prevents me from answering your question accurately and directly, but I will help you by showing you how to recognize a text that looks like a fiction. I hope it helps you.
For a text to be similar to a fiction, it must have characteristics equal to fiction.
A fiction is a story that was built in the imagination of the author, that story did not happen in real life, but was completely created, without any commitment to reality or facts.
In this case, a nonfiction text that resembles fiction should be a text that does not present supporting evidence, but that addresses concepts that were idealized by the author, without any commitment to reality.