Again, your example works fine for some kids, and not others.
Let's not forget, COVID was a free year, regardless. You could play the entire season, 10 or 11 games (depending).
Now, swap 2020 and 2021, get the SAME EXACT OUTCOME, and then you have parity.
2019 - Play
2020 - RS play four games
2021 - COVID play or not
2022 - Play
2023 - Play
2024 - Play
Because that second example, which is exactly Tua's situation, is identical to yours, but with the flip flop of 2020 and 2021.
Again, look at Taulia's situation. It might be different if Maryland had gotten to play 10 or 11 games in 2020. But they didn't. Between the Big 10's weird scheduling, and having multiple games cancelled, Maryland only had a FIVE game season in 2020, half of what teams in the ACC or SEC had. Taulia didn't play in all five games, thus he should be eligible to apply his redshirt year to 2020 AND to take a "free" year (to "play or not") in another year.
2020 was a disastrous abortion for both the Big 10 generally, and Maryland specifically. That's why the portability of the COVID year matters.