I think it's more likely that he saw the VistaVision credit and assumed that that's how it was being projected, given that he would have been 15 at the time.
There's already a thread about that:
https://www.hometheaterforum.com/community/threads/hitchcocks-psycho-the-birds-rear-window-vertigo-on-4k-uhd-september-2020-france.367112/
There's nothing new here. The clip is promoting the 4K DCP, which has been available for a while, and the link is referring to the 4K discs supposedly coming out in France.