How does it work in TikTok?

I get you can edit individual clips, combine them, and animate the combined clip in a desktop environment.

But approximately how are those TikTok clips below (between 09:00 - 12:00) created? I think TikTok videos are entirely taken, edited, animated on the phone (I don't use it) right? But some clips look too neat and stable to come from a phone's camera.
 
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