Maybe the song in question is good; maybe it isn't - that's up to the listener.
You, human, have your own opinions on what you call music; be it inspirational, rock, country, new age, or whatever. Your mind was 'trained' with years of what *you* find interesting or wonderful. You've listened to samples to derive your opinion on what you would create - if you created something. It might be nice, or awesome; It might be utter crap, too.
AI today requires "training" of that AI. It needs to be fed many, many samples (just as we humans are) and TFA mentions nothing about the samples this AI was fed; their genre, style, etc...
But whatever. The article doesn't mention the training program the AI underwent and how much. So, is it really that bad? It's obvious it's not completely random. But, yes, it's going to be a while before AI starts composing top 10 hits under any genre.