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Relevant caveat from its readme: https://github.com/hdl-util/hdmi?tab=readme-ov-file#hdmi-ado...
HDMI 2.0 is capable of doing 4k @ 120Hz, but only up to YCbCr 4:2:0 8bit instead of the full YCbCr 4:4:4 10bit (though I'm not sure how close wayland is to 10bit support). It will be fine for gaming, just not for everyday PC use.
FWIW I also didn't realise this until just now. I've been running my desktop at 4k@120hz recently for the buttery smooth neovide, but have been noticing that text rendering, especially syntax-highlighted text, looks awful. I'd seen the same oled panel render text way better in WSL/Windows (both using a custom pixel geometry[0] via Mactype, but also without), so I spent more time than I'm willing to admit to wrapping my head around custom pixel layouts and hinting in freetype. But no, turns out it was this all along.
If you want to see the effect of 420 vs 444 chroma subsampling on text rendering, this writeup[1] has some great test images and is well worth a read. Also, if you happen to have an LG OLED panel, you can get a little debug window that confirms your signal format and refresh rate, by pressing the green button on the remote 7-8 times.
[0]: https://github.com/snowie2000/mactype/issues/720