He should have 3 years left including this one, but I believe he’d have to apply for a medical shirt for 2022 first (2021 didn’t count, last year while he was out counts as a year).
Sounds like he is eligible for an ORS this year, but I know I read/heard somewhere he wanted to wrestle this year, so your second question would be my main one. I assume he had gone through the enrollment process with Iowa, but while I’m no admissions person so could be wrong, I can’t imagine he can still enroll for the spring semester at a D1 school at this point…