It's a little oversimplified IMO.
Common sense does dictate one should go to the path with the least resistance (open ice). But in a hockey game, unless you've got some really good playmakers, your open ice decreases the closer you get to the goal. So it kind of makes it moot and pretty much mostly only applicable on your own zone on a breakout.
I also don't know how heading to open ice qualifies as a deke. It's a bit of an oxymoron as that tip is really a basic hockey knowledge but deking in general is an advanced move.
In this advanced category, I think the most basic of deke is: 1 Fake (Fake one direction - shift to the other). Most likely the inside-outside move since it's easier to cut outside than it is to cut inside where generally there's more defensive coverage.
Then obviously you move up on depending on how many times you can shift directions, if you can throw in a heel-toe drag, if you change directions putting the puck under the defenseman's stick, putting the puck between the D's legs, also through your own legs, the spinorama, putting the puck on 1 side of the D but you going around the other side, using foot kicks in the deke, or even better yet if you can combine mutliple advanced moves in a single combo.
Now that's just getting sick.
edit:
anyways, just 2 add my 2 cents, the key to deking isn't really on the move itself but instead learning how to "bait." You can practice all the above moves but I guarantee you won't be able to apply it on game situations until you've mastered learning to bait your opponents.