It's a false positive, which can happen with Ren'py games. Just to be safe, feel free to check the comments on this page. The game's been up for years and no one has reported any problems.
To be entirely sure, it's possible to turn off all the music in the options settings by dragging the BGM slider down to zero. Deleting the files won't work due to Ren'py's archiving feature, but I would guess that overriding them with blank sound files would do the trick.
