I have neither heard nor seen anything about this movie outside of some YouTubers showing a picture of the poster, going "you didn't know this released, right?"

If it wasn't for them and this post, I wouldn't even know the movie existed.

What I do is select the camera that I want, select the frame, and press CTRL+B over the timeline, or "Marker>Bind Camera to Marker". I do this for every camera I have in the scene.

You can move the marker after you have set it.

This reminded me of To Be.

Oh, ok! I thought that I might have misread it. I unfortunately don't have an answer to that scenario.

But it seems interesting. I might try to look around and see if I find anything about it.

EDIT: after a quick search I found this video: https://www.youtube.com/watch?v=mFSq0nUl-0Y

Basically, you go to Scene properties and activate Stereoscopy. There should be an option for multi-view.

Add cameras in the menu and give them a suffix, then add the suffix to the cameras.

To render an animation like this, you might have to render as PNG.

EDIT 2: I also found this addon that seems to have support for animations: https://extensions.blender.org/add-ons/multiple-camera-render/