Yes, but if you claim that Illinois would/could have won all of their games decided by 10 points or less, by the same token we could have also lost all games that we won buy 10 points or less (i.e., Tennessee-Martin, DePaul,, Missouri, Grand Canyon, Indiana, Nebraska). That is at least 6 more losses. The same claim can be made both ways
If every team in the NCAA makes a claim that they could have won all of their games decided by 10 points or less, yet they get to keep all of their close wins, then last NCAA season did not even happen. The vast majority of records would be a lot different.