Simply looking at its position in that list will tell you nothing without looking at what is above and below. I don't use Phoenix or Elixir but from what I understand Phoenix tries to be for Elixir what Rails is for Ruby. That is, it is a full web framework. The number one position on that list is a "Asynchronous PostgreSQL driver".

This would be a more apt comparison:

https://www.techempower.com/benchmarks/#section=data-r17&hw=...