Can this work? Yes. Can you just watch this video and apply it in your first fight? Not unless you are fighting someone who knows less than you.

Fights happen fast and your average nigger is going to be throwing constant rights and lefts at you. You need quite a bit of training to be able to have confidence, find the rhythm of your opponent, create an opening and do arm control like this video shows, and have developed enough strength, quickness and coordination to land the required strikes.

bringing fists to a gun fight

Nah.

Eyeballs and ripping balls. Let them know you are going to rip their dick off. You have to summon your inner chimp. Tear off their ears.

Brachial strikes are very dangerous to practice on people. "Bob" torso punching bags are a better way to work on the technique.
There are too many videos where the strike is demonstrated on people to list, and not enough of them warn people about it. Take a look at these two Marines, (youtu.be) for example.

I did this to a nigger threatening me once. Another good move is a direct upright open hand to the nose going upright. Usually breaks it instantly as you knee the brown cow in the balls and kick one of their kneecaps forcefully.

Trifecta KO.

If it's a nigress, a strong punch to the throat followed by a tit punch works too.

So he is committing assault essentially here... That's not exactly self defense... And on a guy smaller than him on top of that lol https://youtu.be/Hzh9koy7b1E?t=48

Now as @Normal said it works, and... If it was that easy and reliable you would see it on every clinch for instance, which isn't the case, for a reason, target is moving among other things...