Did you get the boot.3dsx from the guide or was it one you had on your computer already? In your gif it shows 2.8 beta but I think the latest version is 2.9 alpha. Try using the one from here: https://smealum.github.io/ninjhax2/
Hey, I just downloaded the one from where you suggested and that is still 2.8? Both in the kit and the file on its own?