1.The problem is not this particular book but two common methods used for uninformed audience:use of unnamed sources makes it impossible to verify the content &raises the possibility that either the author is ignorant or he is deliberately spreading misinformation that sells well https://twitter.com/gh_tari/status/1342780551619637248

2. Referring to such sources as the real/authentic ones and silencing/ignoring/dismissing alternative narratives coming from inside the country produces a content that is familiar for the western audience but unfamiliar to contemporary Iranians.

3.e.g.Iranian soldiers' possession of plastic keys to paradise in Iran-Iraq war, taken for granted by many westerners.
There is no visual proof (photographic/video evidence) of such keys & Iranian veterans of war strongly reject the claim.Still a lie told often becomes the truth.