It's not radically different at all. I'm a musician, but even for a lay person, this is as close as it gets without it being 100% the same.
>Similarly, reaching back to classical music to talk about modern synth beats is a red herring.
This doesn't even make sense. It's like saying that referring to a 18th century invention to invalidate a 2019 patent is a red herring. Music is music.
>The final blow is recognition and feel. A huge number of people would recognize Dark Horse exclusively by the playing of that short set of notes much as they could instantly recognize Billie Jean by its opening rift (or any number of other songs). This alone indicates that the notes in question are more than superficial.
No, it only indicates that these persons have a limited repertoire.