While the audio itself might be meaningless, the fact that it has people looking at the scientific reasoning behind WHY people here two different words could encourage some of those people to invest time into learning about audio related sciences, which could ultimately result in future breakthroughs or technology.
Saying "Who cares" and saying it has no "Relevance" to anything reeks of the same sort of jargon people use when they talk about defunding nasa. "Who cares about mars!" "Who cares about the moon!" Technology developed by nasa for use in space has resulted in huge gains for people here on earth.
With relation to football, If everyone in indy hears Yanny, The patriots could create some 3rd down music where most of the crowd heres "Lets go Patriots!!!" and the colt players all hear "Ya'll goat ****ers suck"