I see the change now.
Before you had to have a season reserved IN THAT WORLD to have a player on redshirt. If you wanted to remove that season from that world to another one, you'd have to give up your redshirt status on that player. Now, you don't have to do that.
For example, on my St. Mary's team, I have a player redshirted. Before under manage seasons, it said I had one season remaining but zero eligible to transfer to other worlds. NOW, it says I have one remaining and one eligible for transfer to other worlds. (Never mind that I'll probably be assigning more seasons to that world soon).