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On the projects page (https://suricrasia.online/projects/) it says "Make glitchy beats with randomly generated Opus protocol packets." So I guess it's random data fed into the opus decoder.

author here: this is correct. the opus protocol is so efficient, you can fill a packet with random data and it will still decompress into a sensible sound. this is where all the sounds come from

I've thought about doing something similar for google's voice compression lyra https://github.com/google/lyra

That... how is that a glitch? That's it functioning as designed

My guess would be it's when you chose the codec parameters such the output gets some weird artefacts not present in the original source.

This might be glitching in the sense of “glitch art”, where you deliberately corrupt a compressed file in small ways (flip a few bits here and there, for example) that propagate in interesting ways when decompressed.