“Try again..read it slowly”
What you means is “Try reading this article instead of the one I posted earlier”.
You now send us to a different article. What’s up with that?
Indeed your new article says once upon a time theaters didn’t give start times.
That must have been a long, long time ago. Long before Psycho was released. Who wants to walk into the middle of a movie? Who wants to start reading a book from the middle?
Anyway, Hitchcock didn’t decree that start times of Psycho would be announced. He decreed that you can’t enter the theater after Psycho started.