In video 3, Justin Van Rensburg explains what 'Ketiv Qere' is, how it originated, and why the scribes placed dummy vowels on certain words.
He shows that the Name יהוה was indeed pointed with Adonai's vowels, and explains that the vowels 'Shewa, Cholem, Qamets' are actually the grammatically correct vowels for the reading 'Adonai.'