Wow, I am wishing SO HARD that you could have given the intro to the movie. Even a good intro would be unlikely to be as good as this--this is fabulous. Makes me want to rewatch the movie (and, incidentally, to see those other films you mention at the top--any of those you particularly recommend?)

The person who gave the intro seems both out of touch with contemporary norms regarding spoilers (because, as you say, many people do mind them, and it's the sort of thing that's even joked about in everyday discourse--nobody can claim to be unaware of the fact that spoiling things is a thing) and also just very unskilled at talking about film (or any narrative). Recapping the plot is the sort of book-report thing that people are supposed to get away from in elementary school.