actually defined. The basic rule says an NCAA athlete has 4 SEASONS of eligibility that must be completed within 5 YEARS of starting college. Note that there is a difference between SEASONS and YEARS. They coincide (usually), but they mean and are measuring different things under the NCAA rules. When you get a medical redshirt, your 5 year clock gets extended a year, and you get a 6th year (that's technically how the rule works).

If the NCAA views Bosko as starting his eligibility clock in 2020 (which is when I assume he graduated HS based on him being 22 now), he has 4 SEASONS of eligibility that must be completed within 5 YEARS of when his clock started running. He hasn't used any of his 4 SEASONS of eligibility (he hasn't competed in any NCAA games), but his 5 YEAR clock is running. He has one year left on his 5 year clock. Technically he has 4 SEASONS of eligibility left, but he only has one YEAR left of his 5 year clock. That's the worst case scenario.

Because the time frame when his 5 year clock started running under the worst case scenario spanned the COVID year (2020-21 academic year), he probably automatically gets one more year, so more likely that the worst scenario is that he has 2024-5 and 2025-6 left on his 5 year clock. That would label him a junior, even though he's in his first season of competition and technically a freshman.