I honestly do not know enough about the precedent that have been set to know if this guy has a case or not. There isn't as much similarity between the whole of this guy's song and The Fly as say, Huey Lewis' I Want A New Drug and Ray Parker Jr.'s Ghostbusters theme, but does there have to be? In that case, it was like 80 percent of the song. In this case, it is a general vibe and a 5 second guitar riff. I honestly don't know if it is enough. I hear the similarity.
I also hear a lot of similarities between every other Oasis song and some other British band from the 60s/70s. Noel has been called out on it many times, but the only time I know that he had to pay up was Shakermaker/I'd Like To Teach The World To Sing. And then there's the Green Day song that sounds exactly like Wonderwall. Smells Like Teen Spirit is very similar to Boston's More Than A Feeling.
I honestly don't know.