Not correct.Well if you want to know when Indiana wasn't ranked in the preseason... Try 14 out of the past 20 seasons.
Here is the list of years and IU's ranking in the preseason AP polls. You can look them up on espn.com
2022 13th; 2021 27th; 2020 30th; 2019 unranked; 2018 28th; 2017 unranked; 2016 11th; 2015 15th; 2014 unranked; 2013 28th.
These are the last 10 preseason polls. IU was ranked in 7 of the 10. If you read my post you will see: "I am sure that it may have happened at some point, but without looking it up I am fairly confident that IU was listed in the AP voting in most of the recent past years' preseason voting." 7 out of 10 certainly fits that description.
You seem to think that only in the Top 25 counts as a ranking. That is not true. If it was, then there would be no need for the AP to publish those other votes. The fact that they do means that a ranking has occurred based upon voting and those votes were published.
Your statement is incorrect because mathematically if they were not ranked in 14 of the past 20 then they would only be ranked in 6. It is demonstrated that they were ranked in 7 of the past 10.