Surfboards catch waves, like sound waves?

Perhaps they’ve been using the WaveSurfer software for audio analysis (https://en.m.wikipedia.org/wiki/WaveSurfer).

Hi there, Author of the paper here! We chose Surfboard because 1) it's a fun name and 2) surfers ride waves, and Surfboard works with WAVEforms. That's it really :D

Or a reference to the AudioSurf game which used audio feature extraction to create levels?

Could it be a reference to the SURF feature detector? I thought that was for images though