Today I have made you follow a path which was not less difficult than the path I made you take the last time. To test its value and its validity, wait for what I will have to tell you later.
Another clue you can spot in this story before getting into the meaning of words is the repetition of syntactical structure. Two consecutive paragraphs end with the same "[subject] [verb]. [same subject] [different verb]." punchline-thing. AI gets hung on repeating one idea often
You can do a lot to detect AI prose _visually_ without even reading the words. First clue for me is the paragraphs are almost all approximately the same size. Human writers tend to vary paragraph length a lot more, consciously or not.