Tricky to explain better but around 19 minutes 30 seconds into this talk they explain it better
youtu.be/UJI7vPiu-g4?...

You already got some explanations here so I'll just go ahead and mention my favorite variant: take premultiplied colors and add some extra colors where it's been multiplied to black. By doing this you can get a mix of additive and regular blend mode in the same draw call. Common trick in vfx

One of my favorite use cases for an offset depth texture is in zelda botw when it rains. They offset the scene depth vertically to add animated noise on top of objects to make it look like rain splashes. Point the camera straight down and the "splashes" are on the side of objects (up along screen)

I was using 3dsmax back in the day and one of the updates had better handling of bevels and I remember being so impressed by how solid it was at the time. This is top tier stuff! 🙌

The more I think about it it looks like they used some kind of simulated training data. That way it's not technically a lie to say that this is what it can do... it just happens to be that it does it in simulated reality. Maybe not "good" of them but probably awesome for business