Yes it has the code.
I followed it.
everyone i saw was following it.
They do not hard enforce it in my opinion but do recommend it. Your Aris Meeha will also tell you to wear pants when you ask him/her to make the reservation.

Most importantly, carry pants/jeans, it's not just the summer pavilion that has this code, few of their restaurants have it. you can see it on the television when you explore the dining options.