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I would agree with this. This has been way over done in general. Here is a quick edit of Muay Thai legend Sagat Petchyindee teaching just that, don't twist your wrist:

I would say the number 1 factor contributing to the chicken wing epidemic is people being taught that you have to twist your fist at the end of the punch, to add more power or whatever, even tough it makes no sense from a biomecanical perspective. Turning the fist does two things: 1. It makes it way easier to flare the elbow. 2. It forces you to bring the shoulder to your jaw, wich is a good thing. However, you can have a vertical fist / 40° fist and still raise the shoulder... Btw, in old school bareknuckle boxing people used the vertical fist because it's safer. When gloves where introduced, they couldn't open wounds around the eyes of their opponents anymore, and figured out that if they twisted the punch during the impact they could tear off skin and have the same effect. So they started twisting their punches. However nowadays gloves aren't as rough and it's way more difficult to do the same.