Not quite - the voices afiak are pure AI with the tuning, pitch, etc done in post. Essentially treating the vocal signature of someone as if it was an instrument. And pretty much everyone knew the beat and lyrics weren't AI generated, at least from what I've seen. This is going viral after there was a viral trend of people replacing songs with Kanye West AI, so people knew what was happening.
The impressive part is that the voices could be very convincing. That's what made it shareable.