Repeating the same comment does not make it more valuable or more relevant. You keep citing revenue numbers without knowing if they are generated similarly. You just choose to ignore the point. How anyone can make a comparison not knowing that is beyond me. I was always taught that you cannot compare apples and oranges. I note that you do not claim that the same revenue recognition protocols are followed.
As for your tv viewership numbers: the ND Nation data was 2021 and thus more recent. The data you cited was appreciably older and generated in a historically anomalous period. Generally, more recent data is better as it is closer to the present and thus more reliable in proper understanding. In general, when looking at sports viewership and attendance, while positively correlated, interest lags the W/L record both on the upside and downside. A team is bad and gets a low following, it begins to get better and then interest picks up. Likewise, a dominant team starts to slip. The interested fans still follow for a bit but as the decline continues they then slip away. It's analogous to predator/prey curves.
In your own posts, you never are able to translate Twitter followers into viewership as you have no viewership numbers, just assertions. According to Elon Musk, he is paying close attention to the reported numbers as he is trying to value Twitter properly as he is trying to buy the company, there are a high incidence of bots on Twitter, evidently exceeding Twitter's estimates, and bots are not real people. Bots don't buy stuff.
So, somehow you are taking Twitter following which may/may not include bots (and if so, how many bots there are) and then assert that because there are more Twitter followers that translates somehow into more tv viewers in an unquantifiable manner. Huh? That is not a serious analysis. And on top of that, it would seem that those supposedly large number of basketball fans (10X) don't watch the football games of the same institution as Purdue's number is a third larger. Which causes one to question how die-hard are the fans? And how die-hard is their supposed viewership of even basketball?
Then, there is the assertion that IU owns the Indianapolis metro market and that Purdue has no footprint in Chicago. That raises a couple of points: the first being how critical is metro population to viewership? Looking at Census data from 2021, Texas has 29 million residents; it has large cities like Dallas, Houston, San Antonio and Austin. Metro Houston has a population of 6.6 million. Nebraska has a population of just under 2 million. The ND Nation viewership data puts Nebraska slightly ahead of Texas despite the fact that the state of Texas has more than 14 times Nebraska's population and Houston is 3 times larger as well. So the idea that you can translate metro population or even state population into viewership doesn't fly. And just so you know that I am not cherry-picking, Iowa has 1/7th the population of Texas but 3/4 of its football viewership and Texas is a football-centric state.
I do not know exactly where Purdue gets its football viewership but I do know that it comes close to the combined viewership of Illinois and Nortwestern.
I do not know the basketball viewership of either Purdue or IU - nor has anyone presented data that shows it. There are a lot of assertions without real data. There is just a lot of handwaving of numbers without delving into them to see if they are correct and comparing things that may not be validly compared.