The article isn't about not using h,j,k,l completely but encouraging people to use those other keys for movement.
That's not to say Vim's keyboard capabilities aren't useful--they are! Sometimes you just want to move a character over, sometimes you need to justify a paragraph (gqap, or |fmt). But I'll contend that in general, when you want to move to a point in the text, using the mouse pointer to point where you want is the easiest.
When I need a shopkeeper to grab something off the shelf (maybe my favorite dirty magazine, I don't know), I don't say "ok 3 rows down from the top, 7 columns in, no sorry one more column to the right, that's it". I point and say, "I want that one".
(Something like HJUK--or even just WASD--would make more sense to me, but I don't care enough to start remapping all the live-long day.)