FWIW I have the ASUS ROG Swift PG32UCDM 31.5" 4K UHD (3840 x 2160) 240Hz Gaming Monitor - a $1.3k monitor and also don't see anything different in the demo. Maybe I'm looking at the wrong thing. https://www.shadertoy.com/view/XfKfWd
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Make sure your browser lets you refresh at those framerates.
Safari by default caps animations other than scrolling at 60fps (I think?).
This will let you know what your browser is allowing: https://www.testufo.com/framerates (it will also demonstrate the issue that the post is attempting to solve).
I only get an hyphen on the iPhone
I got 60fps/60Hz on mine (iPhone 16 Pro, iOS 18.2).
Just FYI, you can go to Settings -> Safari -> Advanced -> Feature Flags -> Prefer Page Rendering Updates near 60fps and switch it off to get 120Hz