This may be true of UA, but several "I Promise" students have graduated from Kent State. As of last year, 74 "I Promise" students were pursuing college degrees.
It's also worth noting the school opened in 2018 to 3rd and 4th graders, and didn't extend to grades 1-8 until 2022. You're not seeing many college graduates yet because most of the kids aren't old enough yet, not because it's a failure.