These tricks have to be self learned.
Watch it in super slow-mo and you will get it eventually.
Remember, when getting 1.5 hook, you really want your follow through, and you really want to stick in your left hand finger slightly delayed after your whip when you are learning. As you get more consistent, start sticking your finger in earlier and earlier until you got a solid hook.
For Iwasawa hook, you won’t find it on that video, you really just hook hard, and let the back string hit you like a brent stole, but don’t bring your hand forward, and let the full hook come around again, and let it hit the yoyo. Just pratice.
One more tip, don’t just hook hard, you really need to make a full circle motion. If you watch that video, his hooks are very solid, and he always makes a full circle.