Use ChoiDujourNX to get the exFAT update as it is the easiest way to get it offline.
Let's construct a simple scenario. Say the NAND is represented with this blue box and connecting online means showing this blue box to Nintendo. If I enable Airplane Mode or put a sheet over the box, Nintendo won't know what I'm doing with the box until I take off the sheet. So say I paint it red but keep the sheet on at all times. Then before I take off the sheet, I return it to its original blue color and thus Nintendo sees no modifications to it. However if you paint it red without the sheet covering it, Nintendo will see that you modified it meaning you cannot return it to its original blue color.
So, this basically means that if you reported an error to nintendo and then went back to a clean nand, they will know for sure that you did something wrong. Right?
At this point I just feel sad that I only used it for emulation and some homebrew. I bet there's a lot of people on the same situation, who thought that using HB launcher was innofensive, and going back to Horizon to play original games would be fine.
*sigh*