That's a lot of images to lose if it dies and you are the sort or person to leave it in your camera and only empty it when full.....
Perhaps its in anticipation of 8k
......Since there are 1TB portable hard drives out there for much less cost, even using the card to store images doesn't make sense. It will be interesting to hear who ultimately chooses to invest in them. But perhaps that won't be too many DSLR NEF shooters.
One can't exactly put a 1tb portable drive in their camera's card slots.......