Quality does vary wildly because the languages vary wildly in terms of language constructs and standard libraries. Proficiency in every.single.language. used in the benchmark perhaps should not be taken for granted.

But it is an GitHub repository and the repository owner appears to accept PR's and allows people to raise an issue to provide their feedback, or… it can be forked and improved upon. Feel free to jump in and contribute to make it a better benchmark that will not be «frankly a joke» or «_really_ bad».