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Because it's not.

It's an undergrad assignment basically. The writeup is nice, and it's great that it's on arxiv but it's not novel nor publishable research. The implementation that ships with a given OS is sure to run around in circles around it.

A good paper will describe how the work is interesting or useful in the field and how it opens the door for future research.

Here the author acknowledges that other libraries may be more performant, but describes the motivation for the work as essentially something that’s a small piece of code to maintain, and easy to use.

I didn’t run the code but I read through the paper and it doesn’t seem like it’s made a convincing case for this.

Depending on which C++17 standard libraries are being used, performance efficiency may be an issue and platform dependent.