They can’t let the shuttle go uncovered but were they to do any other sort of story the newscasters might be required to learn something about science. And since most Americans don’t really know anything about science anyway you get pablum.
Could be this.
But I think more it has to do with slow news day (i.e. the filler possibility), or my best reason - a writing device to catch the reader’s attention and relate to it.
Space news isn’t exciting anymore, it seems. Not everyone is an astronaut or interested in the technicalities of the mission or launch. Put something about Free Bird in the title and it sparks some interest.
Looking at the article only a few sentences even talk about the song. The rest is about the astronauts and mission.