I can't speak to the preseason model that KFord uses, but I think #30 is highly undervaluing Illinois. Also, it is not a good apples-to-apples comparison to use Illinois pre-season ranking and look at the end of season power rankings from last season. It is very well possible that the Illini would need 8 wins to remain at #30 in their model for final rankings (especially if they ultimately value the Illini schedule as very weak, which it appears that it very well may).
The coaches around the country clearly see Illinois as a CFP potential team, hence the pre-season ranking of #12. I really cannot think of many fans of a team that would be happy with a 7-5 regular season record after starting with extreme hype. Virtually every fan will say the season was a disappointment. Yes, historically 7 wins would be considered a good year for Illinois, but we are in near unchartered territory with a #12 ranking entering the season. The season after the Illini lost in the Rose Bowl to USC, the Illini were ranked #20 pre-season, so they were hyped but nowhere near the extent of the team this year. It seems like you are preemptively preparing for an underachieving season by rationalizing a 7 win season still being good.
Coach B has raised the expectations of the program, so it is very logical to be disappointed with a 7 win season, especially given the team is built to win this season. I guarantee that the staff and team would also be highly disappointed if that is the final result. Expectations going into 2026 season will be very different, given the team will be much younger, so 7 wins might very well be a good season. However, we are talking about 2025. 7 wins would be a huge disappointment, and 1.5 games fewer than the over/under set by betting markets.