As suggested in the introduction, one would think it was called "the relative performance of C and Rust" because this article is a corollary to a previous article and conceived as a response to an inquiry regarding that previous article--specifically, to answer the question "in your given benchmark, what explains the relative performance of C and Rust?" :P The basic answer: "data structures"; the insightful answer: "data structures that were originally chosen to play to the different strengths and weaknesses of their respective implementation languages, giving us food for thought as to how language design can shape the solutions that users of that language will tend to arrive at, and the performance implications thereof".
Just because that would indeed focus on the specific sub-portion of the article that you think is most important, doesn't necessarily make it better than a title that meant to encompass the issues surrounding whole act of benchmarking, specifically between languages that might encourage different idiomatic solutions, and then drills down to what that means in this specific instance.
In other words, what you took away from the article might not have been what other people did, or what the author meant to express. It surely wasn't what I thought was important (but neither was "rust is faster/slower than C").
