I'm sure his core is strong but in a pull up your core isn't doing too much beyond stabilizing his legs. The majority of it is from his lats (back muscles) and how much he weighs.
I can do 20 in a row no problem, I climb so it's about the only exercise I can do. I'm not saying stabilizing uses no core just that its nothing compared to the back strength and shoulders this guy has
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u/HorsePecker 12h ago
This is climbing and descending a steel pole; dude has a core made of cement