The guide actually told you to restore sysNAND with the emuNAND.bin you currently had in your SD. (Which was the bricked 2.1 emuNAND it previously told you to install.)
btw i feel this a good time to remind you guys that sea of thieves was made by rare, who also made DKC1-3 and DK64, alongside banjo kazooie and conker's bad fur day