I feel like even hardcore Vocaloid purists would consider that to be a stretch, at least since I've seen said purists defending the song for being framed in a negative light and not explicit enough to call CP.
Notably a producer, Kikuo, who's known for making music with very dark themes, got cancelled a couple years ago for making a comic about a child being groomed and exploited by an older woman. It was a whole shitfest that led to him having to make numerous statements on the matter on twitter defending how the comic wasn't meant to be glorifying but show how damaging the act was for the kid mentally.
Even though I don't believe it did much to affect his bottomline, it seemed to be something very distressing for him to have to deal with, especially considering he doesn't appear to know English all that well.
He also made
a song (warning: very gross) about a child being gruesomely exploited by their father and other men, that while gratuitously grotesque, is negatively framed. He was still dragged for it.
Slightly veering from that, I believe this year someone tried to stir the pot about a popular classic Vocaloid song,
magnet.
It's so popular it's been featured in multiple versions of the rhythm game and live concerts produced by the company that created Miku, so it has the approval of those whose opinions actually matter.
The song is about the two female singers being in love but unable to be together because of the taboo surrounding same sex relationships, which while cliche makes sense from the perspective of how homophobic Japan is. This flew over westerners' heads because surely instead this song must be about the forbidden love of pedophilia since Miku is 16 and Luka is 20!
