I'm guessing the user you're replying to is meaning that the vscode default config file is 11k lines and the AI setting just one of many lines in the file.

I don't think they meant that their own settings are that long, just the default in the app and they're commenting that it's ridiculous to expect a person to find it there.

Ah, well, I found this AI setting via github issues browsing, LoL, so yeah it's kind of hidden. May be there are better ways.