That's not 100% untrue. However after 2021 we are required to be back to 85. Therefore any loss caused by players getting an extra year will be mainly in the coming year. So far we've only seen guys move on that are looking for more playing time or aren't likely to get it here. What they are leaving out is every school in college football has this same opportunity so it may not be greener elsewhere.
Looking at the seniors returning we have 4 players and a kicker. (Joking, sort of)
PK- Assalley, we've had a transfer and a comitt come in to compete.
TE- Allen, losing one of our big three opens up snaps for others and allows Moore a redshirt option.
LT- Foster, This is probably where the statement could be true in the future. However, what it really appears to be doing is give the guys younger than Treiber and Ramos another year in the system before an open competition in 2022.
FS- Eisworth, losing White at SS allows our most ready guy in the wings to step into a starting role. So I doubt Eisworth returning would do anything more than push guys that are likely to get passed by a younger player to move on.
And remember this quite possibly convinced some guys to move on which opened a scholarship for Rory Walling.