C418 doesn't appear in the compose credits, which is odd, considering that he also works composing music at the moment. This issue is fixed in the pre-release of Java, so this can be considered a parity issue.
Step to Reproduce
Go find C418 inside the credits.json, and see if it's there.
As far as I know, unlike Java, Bedrock doesn't have background music and jukebox music by default — you need to get it via a special resource pack. That may be the reason why he isn't listed in credits.