Oh I just double checked that I followed the whole guide for EmuNand instead of the CFW-no-emunand one. I guess that I launched sysnand CFW by accident, then. Considering that I want to keep Sysnand completely clean, should I proceed to restore my Nand backup?
EDIT: Actually, I just launched it again and made completely sure that I tapped the "Atmosphere FSS0 EmuMMC" icon. And it still shows "9.1.0|AMS 0.10.2|S" on my version number. My SD card was partitioned as per the guide, so I don't get what I did wrong...
EDIT²: Just found out I skipped the "making the emuMMC " step of the guide, probably because I got distracted with the NAND backup details below. That was the issue, just in the unlikely case someone else faces the same problem.