(I had the impression from somewhere else that his "reverie or day-dream" might have instead been a pipe dream — as in the literal pipe dream (opium?). But I can now find nothing to substantiate this at all so, maybe just ignore.)
EDIT: perhaps I was reading too much into this page from the Golden Book of Chemistry: https://www.slideshare.net/slideshow/the-golden-book-of-chem...
https://i.imgur.com/EGyYmkX.jpg
https://www.nytimes.com/1988/08/16/science/the-benzene-ring-...
The answer is probably because the author hasn't taken organic chem and so never heard the story.
Also, I know that what the anglosphere calls "gas", "gasoline" or "petrol", some other European languages call "benzine". Benzene and petrol are both hydrocarbons, but other than that similarity I don't know why that name would be used. I saw somewhere that it is actually "Benz-ine", as in Karl Benz.. but that sounds dubious.
For me, no other story from Chemistry is as fascinating as Kekule dreaming up Benzene’s molecular structure. An important reminder to me about the power of narrative and storytelling.
When I read a "History of Organic Chemistry" textbook, Kekule and Benzene were essentially the springboard.