It's definitely an attempt to compare models, and Gemini clearly won in the tests. But, I don't think the tests are particularly good or showcasing. It's generally an easy problem to ask AI to give you greenfields JS code for common tasks, and Leetcode's been done 1000 times on Github and stackoverflow, so the solutions are all right there.
I'd like to see tests that are more complicated for AI things like refactoring an existing codebase, writing a program to auto play God of War for you, improving the response time of a keyboard driver and so on.