It's not for me. I can see the appeal of these shortcuts, but I can see it being a wtf down the road once I've forgotten that I have them in place.
Also with something like auto-correct, you have a visual affordance that alerts you to the change (with the option to override), which just happened when I misspelled 'forgotten' above. The shell doesn't have that so something just happens without any actual correction or indication the user may have made an error. Although I am not a 'fish' user, this is something that I think it does well.
I was interested in the claim that it is warm-blooded (based on your quote). I went to the article and the link associated with the term 'warm-blooded' leads to an article that makes absolutely no mention of warm-bloodedness or thermoregulation. As such, I'm not going to put much faith in the article.
Although I have heard the name before, I am not familiar with Nonviolent Communication. However, reading through the article, I could not help but notice the strong similarity between the 4 steps of NVC and the OODA loop (https://en.wikipedia.org/wiki/OODA_loop).