Well they banned AI vocals at all too, so you can spend 6 months composing a track, add AI vocals, and your entire song is banned. Really the entire genre of edm could often switch out whatever vocals they have...

I have zero idea how much this matters since I don't really think anyone views the charts to find their next song to listen to. If a song with AI vocals is good it (might) pop off, I don't think getting on the charts at that point would matter.