Steno machines are also "chorded", and they type in a form of shorthand where sounds, words, and phrases can be represented by just a few characters. My guess is that given equal skill levels, a steno machine would still be faster.

Stenographers usually use something pretty similar so I doubt it. The ones I've seen (to be fair, live captioners, not stenographers) use something that's closer to a piano than a normal keyboard, and it types full words rather than letters, but also has a regular typing functionality. Pretty cool to watch honestly.

No way. Stenographers can transcribe speech live. Some have been timed at close to 400 wpm. While the top chorded typing is closer to 250wpm. Good, but nowhere close to a stenotype. Both are pretty ridiculously fast though. A pretty fast typist can barely approach 100.