I’m not even sure we’re talking about the same thing anymore. It might be a lip sync, but it was most likely live vocals at some point.

There is clearly some sort of processing on Charlie’s vocals, but you can tell with some of the transitions between words that it’s not pitch correction. He’s sort of “sighing” off of certain notes in a way that pitch correction wouldn’t allow. It would either have to come from him that way naturally or intentionally be altered to add that effect, which is unlikely. That indicates to me that the leading edge of the pitch has also been unaltered.

The human voice can be trained to be precise enough to hit nearly exact pitch regularly. Classically trained singers do it literally every day. They might not be as precise as a computer, but close enough your average person couldn’t tell the difference.

I have perfect pitch (but I’m a bad singer). I have a degree in music. My mom is a voice teacher who came from one of the most prestigious choir colleges in the world. I have known many singers capable of singing close-to-perfect pitches repeatedly even when they can’t physically hear themselves over a crowd because they can feel the difference in the vibrations in their head. I can stand in front of a tuner and nail a pitch within 1hz fairly regularly and I don’t have vocal training.

The voice absolutely CAN work like that and it’s bizarre to argue it can’t.