Ohio State is worth a shot if you apply early. They take geographic location into account and I don’t believe they have a ton of applicants from Nevada. The National Buckeye would be a possibility because he would be compared against others from his state/hs applying.
They direct admit into CS/CSE and you can not transfer into that major at Ohio State, so he needs to indicate CS/CSE on his application. If he is rejected for CS they could still offer admission to the university.
The ECE department is well funded and a direct admit program, so a good plan B.
Declaring a CS/CSE minor has been another way to get registration privileges for the CS/CSE classes that are reserved for CS/CSE majors.
ACT info:
I’d be inclined to submit the test scores to Ohio State, I think they are in range. Is there any possibility of bumping the 24 up a bit in a retake? That might be needed for merit aid.
Please note: applications need to be complete by the EA deadline (that means scores, hs records etc. received) so plan to apply a few weeks before the EA deadline so that if there are any issues with getting those documents in there is time to resolve any issue and continue to check the applicant portal to verify that the items are received and the application is complete.