@IlliniDad18 She already corrected her post to indicate 15% int’ls.
I think we all can agree that IL students enroll at UA because they can’t afford UIUC, they can’t justify the cost, or they didn’t get into eng’g or the school…or maybe they want to attend a school that can win football games. 
No one is suggesting that UIUC isn’t a great school, particularly for eng’g. But if an IL family has 2-4+ kids and they can’t pay $120k+ per child to go to college, then UA can become an attractive alternative, including for eng’g.
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UIUC (particularly the COE) continues to enroll increasing selective freshman classes.
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and so does Bama.