As Dr. Ron said, all SS Classic ships, other than Nova, still use the traditional nomenclature; formal, informal, and casual. Based on the Silver Nova graphic you posted, it’s clear there is no longer a formal “requirement” in any dining venue.
I do like the clarity that your graphic provides. It certainly makes the minimal requirements expected of men clear. And, while the graphic probably won’t resolve the age old debate of why men should even be required to dress informally at certain times, we now know that on the Nova at least, men still need to wear a jacket on formal nights, even if they choose to dress accordingly as “Elegant Casual”, i.e. what SS used to refer to as informal dress. We also know that even if the night has been declared as casual ship wide, men will still need to wear a jacket in La Dame, should they wish to dine there.
Coming from a super casual family who initially chose SS for the formality of its dress code, I, for one, applaud SS’s efforts to try and accommodate the wishes of many who would like to dress more casually for the entirety of their cruise, while still providing an opportunity to dress formally to those of us who like to to do so. I assume we’ll know soon enough, probably by the time Silver Ray enters the fleet, whether the attire test on the Nova was successful, or not. 🤞