The perimeter of a square and its length. is it linear or not?

From Alfred Hitchcock’s examples, it is clear that he expects readers to be familiar with his films. However, some readers may not have seen Hitchcock’s movies. From the examples in paragraph 3 and 4 I can infer that he created bloody movies full of violence. It states, “A man has been murdered,” and “slugs him into insensibility.” From these phrases you can certainly conclude the type of movies he made. However, in paragraph 6 Alfred Hitchcock says for himself, “For 17 years I have been making pictures described alternatively, as thrillers, dark mysteries, and chillers, yet I have never actually directed a whodunit or a puzzler. “ Here he confirms the type of movies he created.