it’s because you pressed I in the timeline and not in the 3D view.
Also kind of because you are on a different version. Pressing I in the viewport will just key the thing now. If you want to see all keying sets, press K
Got it. In 4.3 the i key in 3D view is just inserting keyframes without any menu coming up.
Your mentioned k key seems to do, what the i key does in the tut.