Not sure where you got those statistics and cannot dispute the very oldest ones. But I was a student at Ohio State between 1972 and 1976, and while our class went to four straight Rose Bowls (lost 3), were undefeated by that Team Up North (3/0/1), were ranked No. 1 for most of three of those seasons, and I was a classmate of the only two time Heisman winner, we ended up the season ranked no. 1 exactly zero times. Great teams but NO national championships, zilch, nada, didn’t happen.
I took it off of the site linked to the article. There were many polls at the time with some disagreeing with others so mythical national titles were shared. According to the stats, Oklahoma, Ohio Stare, and Alabama shared the title in 1975.