From the end of the article - "And, if the program is indeed
not allowing players who opt out of the season to participate in practice or any other team activities — a very reasonable stance if they are opting out over safety concerns — they need to state that."
If players are opting out of playing, why would they be included in practices? They spend much more time during the week practicing, lifting weights, etc, than they do playing on Saturdays. So that's much more exposure and a bigger risk than just playing the games.
For the record, I don't care either way what happens. If they feel strongly about these issues, then opt out, but opting out includes everything. Doesn't it?