In a thread about the 2017 Nagoya, I found a similar question.
I agree with that it is a convenient, modern solution to share the code with GitHub and download it to the robot wirelessly.
But I am afraid that communication trouble may be occurred at the limited time before the game. Speaking from the former participant’s point of view, even if the wireless connection is permitted at the local competition, I think that it is better to use the wired one.