The top spots in that specific benchmark is mostly Dart and Java-based frameworks, Java only comes in at position #4 with Undertow and #5 with Servlets and Go manages to sneak in at #6.
See:
The knowledge Google gained from building NodeJS, they applied directly to Dart on the backend, RedStone was the first backend framework that became available and even back then it was running circles around most other frameworks.
Under the hood, Dart backends typically have an event loop, it's single threaded and in order to utilize all the available processing power, it uses these things called isolates, they're similar to Java threads, just much heavier on resources, almost like starting a second Dart VM.
Since Dart is optionally typed, all type information is thrown away at compile time and what you get in runtime, is a system that doesn't have to do any type checking, type checking is taken care of during compile time and all that extra processing is available to handle requests.
So Dart backend servers are similar to NodeJS, the only difference is that it doesn't have to deal with JavaScript hence the reason Dart is sitting in the top spots and NodeJS is waaaaay down the list.
I noticed that these benchmarks test different things, some test against PostgreSQL while others test against MongoDB, etc. So database drivers will obviously have a huge impact on these numbers. The Dart tests were performed on MongoDB which allows async processing, had they used a SQL flavour that blocks, Dart would have struggled.