Those old videos aren't pretending it's their own. Those videos are both from 2006, early in YouTube's history. The uploaders got the file from Kazaa, eMule, eDonkey, etc. a few years earlier like everyone else at the time and it was not called a "TAS" or described in any way. They found it amazing and they had a site they could share it on now, so novelty dictated that they upload the cool video they found of someone beating SMB3 in 11 minutes.
By the way, if your TAS doesn't break all existing records (both RTA and TAS) in its category, don't submit it. Just upload to userfiles the input file (necessary for other TASers to easily critique your work) (make a video too if you want it to be easier for people to watch, though!) and post it in the respective game thread on the forum if you're looking for feedback. EDIT: Added... advice from Spikestuff.
Wiki: EmulatorResources/NESAccuracyTests
