The new policy forced him retire. That’s what happens when you change the status quo. If the policy was that only players over 200cm could play, you’d concede he would have been forced to retire. You’re confused here by the illusion of choice.
Let’s say you went with your family to the park for a nice picnic in the sunshine. Halfway through, it starts raining and some drunk skinheads turn up and start playing loud death metal and swearing. You could say if the family ended their picnic at that point that it was their choice, but it would be equally as truthful to say that choice was made for them by changing circumstance.
if you don’t want to see the other side of the coin fine, but it sure does exist.
Both of those examples are utterly inane. Your first example WOULD be a forced retirement as there is no solution.
The second example sure (ignoring the fact that it is drawing an incredibly long bow), it 100% is their choice as they don't like the changed circumstances. Facts are they have changed and that family had the choice to stay or leave.