i'm not sure how the tweet you cited and this year's ILLRTC summer success correlate.
however, yes, people in the state of illinois do overvalue/overestimate how good their HSers are.
(also, if you're saying Ludwig should land more blue chippers at Norther, please tell me who he should have landed. i think the Illini are actually more guilty of that than Northern, who is a mid major. There were six Top 50 recruits from Illinois in 2023 and Illinois only got one of them. Last year, Illinois had zero in the Top 50.
Let's now look at AA's. The state of Illinois produced 8 AA's in 2023 and 2022 and 7 in 2021. This is how many wore block I's.
2023 - 0
2022 - 0
2021 - 1 (Dylan Duncan)