It started with the legendary square root function. Which lost its legendary status once it turned out Carmack wasn't the author.
Now it is about standard BSP technique from Computer graphics text books from that era.
There is also hype about Carmack solving AGI by 2030, when he is yet to publish a single widely cited AI paper.
EDIT:
I am guilty of reading the first couple of paragraphs and assuming this was Carmack worship. My bad! Leaving the original comment, mostly as is.