If you mean update SysNAND to 7.0 and install .NSP files in EmuNAND, then yes.
If you read a little up above, certain titles will not launch without a linked Nintendo Account such as the NES app or Pianista. I don't know how many games actually require an account nor any resource that lists games which do require an account but they are definitely in the minority. You also cannot link a Nintendo Account without updating to firmware 7.0 which breaks all CFW for the time being (at least until CFW gets updated to work with 7.0) so for the time being, you will be fine without linking an account.
Thank you for your responses, you really helped me out.