This is excellent advice - it's the best screenwriting exercise I know of. I'm a film editor. Often we end up doing this in the edit - sometimes because the screenplay ought to have been edited more aggressively, but often because, once you've got the images, you really don't need all those words.
It's astonishing how a snippet of a glance from a good actor can replace paragraphs of dialogue.take you're (sic.) talkiest scene and rewrite it entirely without dialog. You'll find a way. It's a useful exercise.
Apologies for this, kleinbl00. You are quite right that it is intentionally antagonistic.
I was having a horrible day yesterday and I guess I tried to take it out on an internet stranger's typo. It was extremely immature of me, and I've been feeling horrible about it all day.
I hope you can accept this apology.