While TFA indicates that "committed" here refers to an inadvertent `git commit`, it is important to note that, in cryptography, there are some very important meanings of "committed key" that are useful and desirable. TFA does not mention these:

Key-committing AEAD: https://en.wikipedia.org/wiki/Authenticated_encryption#Key-c...

Signing Git commits: https://docs.github.com/en/authentication/managing-commit-si...