Programmers are lazy, sorry to say that. Although I am not a full-time professional programmer, but I think I am more lazy than average programmers probably.
We try our best to avoid repetitive tasks as much as possible, and we always dig and explore the possibility of the tools that we are using to reduce the number of keystrokes, and save our life, if it is possible 😌
Just realize the quality of the video is so sucks, so have a look at the screenshot below. Just right click the image to open in another tab/window to see the full size.
You will need to create a new bundle for yourself, and add the snippet (or any other customization) there, it is not a good idea to add it into some other bundles.
Press command+N to open the “Create New Item” window, then you can select the type of item you want to create for your bundle.