Impossible for a color combo to be dated.
Makes absolutely no sense!
I think it is sad to think of all the In Style readers getting rid of red items.
Dated is when there is also a style associated with a particular color combo such as avocado and orange kitchens. But.. avocado and orange are a winning tropical color combo on the right person and in the right context.
I vote for color freedom and no judgement as to good and bad. I tell my students this all the time- there is no ugly color- it is all relative. I also believe there is no dated color or color combo.
BTW,When mixing colors, my students always dump on all of my favorite earth tones UNTIL they put a gorgeous mushroom next to an almost pure violet. Then they see the beauty of the mushroom.
Black sometimes needs strong color to balance it's weight. That will never date. It is just a color principle