Look; I'm seeing a lot of reasoning across comments from non-native language, keyboard input, autocorrect, and so forth.
None of this changes the fact that the usage is just flat out wrong. Have we become so soft in society that nothing can be pointed out because of speculative reasons?
If it's a 2nd language, learn the language. If it's the keyboard, get a better keyboard. If it's autocorrect, double check what you write. Stop making excuses for everything.
All these cries for why we should accept there/ their/ they're uncontested is no doubt a reflection of the frustration Carmack must have experienced, if HN is any indicator of the FAANG workforce. John is known to be very direct and unapologetic himself, and here y'all are losing your mind on a slight criticism. It's no wonder.