It was HD for the technology at the time, and qualified under the definition.
A friend worked at CBS at the time, and we went to the 57th St studios to watch the broadcast (who had a HD TV then?). We all remarked that the cameramen needed to repoint the focus for the 16x9 frame. They were still centered on the LOS, which left big open spaces behind the RBs, instead of capturing more of the defensive formations.