On the opposite page it shows a Sept.1969 date.
I don't think thats a printing date on the bottom,but more likely a publishers deadline code.
Remember,the new 1970 Camaro & Corvettes weren't officially announced until February 13th,1970,so they ran the 1969 Camaro & Corvette bodystyles longer then usual,up until the new release date of February 26th,1970.
Personally I'm curious why the show a drawing of a 69 Camaro,and not an actual photo like the other models..