But that's the thing - the article author is talking about a context menu, which by default means that everything from the context menu can be done by keyboard

But that's the thing - the article author is talking about a context menu, which by default means that everything from the context menu can be done by keyboard means. As for me, I'm another greybeard that doesn't need a mouse, but defaults to using it over a keyboard-only setup. Keyboard shortcuts are great for things that are frequently done, but I'd rather not spend the time to remember rarely-used features.