Doesn't mean it's not music. But that means you made the music using the software. So all those cool Sega Genesis chiptunes that were composed back in the day and even some today or c64 sid chip music is absolutely music. Same with Amiga mod tracker files.
The very old school synthesized music still required traditional music composition skills. Yes, some people did try to use MOD files as a crude loop based format, but due to memory and bit sample depth constraints, the end result was usually pretty rough.
If you have any recent-ish Apple hardware kicking around, it actually includes a loop based music editor: Garage Band. My point really wasn't that this is a less legitimate way to make music, just that the end result isn't typically what we think of when we think of a music composition. You don't get traditional notation that you could hand to a band and have them play your song. You end up with an arrangement of samples, which can then be rendered by the software to a completed audio file.
That being said, people have come up with instruments that do let you play loops and samples live. It looks like this. Yeah, that still takes skill, not gonna dispute it.