I have not seen people mention this before. By pulling back the ring pull as far as possible as shown in the video, it increases the length of the break in the top which makes it much easier to pull off. The difference is big enough to allow someone who’s relatively physically weak to pull the top off whereas without this technique it’d be impossible. It just took me about 20 years to figure it out 😎😉. I have dog food in the house not because I have a dog but because I feed foxes at the end of my garden.