One thing remaining unanswered is where this issue is documented. The link doesn’t go to a relevant part of the video…
… nor should we have to watch a video to answer such a vital question. CLI features need to be readably documented (i.e. text, like a web page) at the time they are released, and remain that way for the duration. They can’t just linger as a footnote to an unknown place in a 90-minute video; it’s unhelpful, embarrasing. See this whole thread on the subject, which remains without an official answer: