I see a lot of criticism about tmux and other non-core items being included in the overall curriculum. I think the author is trying to portray the workflow he is currently on and exposing the full tool kit he uses. I don't think he is saying - this is "THE" approach one has to follow. I for one think that this is a perfectly legitimate way of teaching. People can leave out pieces which do not interest them or substitute them with other tool sets if they chose to.

For me the key take away here is that - some one who has been a consistent beater in the Kaggle competition for two years and the founder of a ML company is teaching a "hands-on" course which fills a gap (from tech talk to step-by-step hands on) and I think I can live with this method of teaching.