He's playing his 5th season right now just like every other kid that got a Covid waiver. Even if one of those seasons was shorter than he'd like.
If he applied for a medical redshirt for his sophomore year (20-21), he wouldn't have been counted as playing during the Covid year, and wouldn't be eligible for the Covid waiver. That would be like giving Stephon Castle a Covid year... it doesn't make sense because neither of them would have been playing college basketball. Cam claimed a Covid year; that means he was playing basketball.
There is just no solid argument for this other than some appeal to emotion because someone else got to play more. Those arguments only work if you play for Duke or Kansas.