Why did `exiftool -rotation=0 input.mov` rotate my video?

I have an input.mov video file recorded by an iPhone 12 mini. I copied the video to my Windows 10 laptop. When I open the on video on my Windows 10 laptop with VLC, the video plays in portrait mode. I ran the following lossless exiftool command:

exiftool -rotation=0 input.mov

and now the input.mov video file plays in landscape mode with VLC. Why? I thought -rotation=0 would do nothing.