I was hoping to see the same. As I understand this, it would lock the notes to obsidian only, instead of being somewhat agnostic to the note taker medium.

(developer here)

I specifically tried to make this mostly Obsidian-agnostic - the algorithm to generate these note codes is very simple and only requires the note's path relative to the vault.

Here's the whole algorithm in Python:

    import hashlib
    
    def hash_string(s):
        h = hashlib.sha256(s.encode()).digest()
        n = ((h[0] << 16) | (h[1] << 8) | h[2]) % (32**4)
        a = '0123456789ABCDEFGHJKMNPQRSTVWXYZ'
        r = ''.join(a[n // 32**(3-i) % 32] for i in range(4))
        return f"{r[:2]}-{r[2:]}"

Plus, Obsidian kind of already has this functionality. You can give any note an alias, and all linking to that alias will instead link to the note. So if you're not worried about being agnostic, and unless if you want to mark every single note, I still don't see the point. And even then, even assuming that you do want every note with a code alias, you can just set it up on a template.