I also laughed hard when watching the video, so I understand ππ
There are certain warm ups you'd have to do before you can attempt the whistle note and you also have to stay hydrated before doing it. But I'm sure if you had raised your hands very well, you would've gotten it right π,just kidding.
Yes they're so many other techniques, this is the one I found easier, the other ones were a bit complicated and since I had little time to practice too. You can check YouTube for some tutorials, or I can recommend someone I learn from if you'd like.
Thank you, I'm glad you enjoyed my entry π