When Nintendo releases it. NTRBoot is a bootrom exploit and can't be blocked by
ANY OFW update. The only way to stop this exploit is with completely new hardware, to which the 2DS XL is using the same hardware as the new3DS. Which means it has the same bootrom and exploits related to that bootrom.
Well then you found some out of date links. Google doesn't always provide the most up to date information.
You will either need to buy a cart and have a method in order to flash it. There are actually several methods in order to do this and all of them are listed in
The Guide. You can also buy a cart and have someone exploit it for you from this
link
The other methods are hardmods and or buying an old2DS, hacking that, and preforming a dsiwarehax through a system transfer.
None of the 3 main methods can be blocked by Nintendo.
You can also send your system our to be hardmodded
https://gbatemp.net/threads/list-of-hardmod-installers-by-region.414224/