I think it's pretty clear from the description that it's only a ~250 line toy project. Looks like it's meant to act as a test for implementing the same project

I think it's pretty clear from the description that it's only a ~250 line toy project. Looks like it's meant to act as a test for implementing the same project in different languages. Given that all the implementations were around 10% of each other it doesn't seem like a particularly conclusive result (as far as line count goes, which looks like it was the main metric). At that point minor things like code formatting will make a lot of difference (for example the C# solution is the shortest, but they're using a more concise brace style than the standard one for C#).