Check the date on the tech demo 
Do you get up on the wrong foot every time in the morning recently?
His only comment was, that the sound effects sound awful familiar, which they do, as you sure know. Obviously, he was not saying, that the tech demo stole the sound from MWLL...
The question is
why this sound exists in the techo demo and now in MWLL too. Maybe it's from some sort of common, open or licensed sound library for instance.
