A spatial video, by definition is 3D. It can only be played on a Vision Pro and not on any other devices.As stated the same video plays in 2D on other devices.
On other devices, it's just a video. Not a spatial video.
Since the iPhone (and apparently canon APS-C cameras with this lens) are the only portable devices that you could use to shoot a 'Spatial Video', it is not possible to shoot the video and see the 'Spatial' results on the device you recorded it on.
I'm not so sure why this is so difficult for you to understand or why I need to keep saying the same thing. If it's not playing in '3D' it's not spatial. Spatial videos cannot be played on any other Apple devices besides the Vision Pro - including the device that Apple is touting as being able to record them - the iPhone.