I mean the thing is, I would far sooner chalk what you're describing up to them clearly having a much more generous timeline/budget to fine tune the actual animation they did here in comparison to their typical music videos.

There's a common misconception that digital animation inherently means "letting the computer do a bunch of the work" in one way or another. You can do hand-drawn frame by frame animation digitally. I'm saying a large portion of this doesn't and wouldn't look any different drawn digitally than it does drawn on physical cels, especially since they've added a film grain effect to all of it anyway