Yes, it is the backup of your 6.0 sysnand backup. You can also restore your 11.0 emunand after you installs A9LH, so you won't lose everything you have so far. The emunand backup and restore section is in part 3 of the guide.
Thank you. I am doing it now with fingers crossed. Wish me good luck. I'll be back again to say if I succeeded or if I need to buy new console. xD