I have no idea what Neil Young actually believes (and I don't especially care), but I do know that it's possible to be pro-GMO (or even just neutral) in the first sense and anti-GMO in the latter sense. And that's the position that I've seen otherwise scientifically informed people take.
(This is ignoring some other reasonable responses, such as "what do GMOs have to do with Spotify?" and "why do you think that being anti-GMO makes you anti-science?", but there are only so many hours in the day.)