No, youtube has been fake with everything 3DS-hack related.
There should be a new thread titled "DO NOT BELIEVE YOUTUBE" because every single 3DS "softmod" has just been a trolling attempt.
And I think that video cropped up a while ago; if I remember right the guy password locked the downloadable RAR and never gave the password. Anyways I think it was all EXEs and DLLs that he says sent hacks to the 3DS.