Roy had won the FA Cup as AFC Richmond manager by Ted Lasso season 4.
The season 4 premiere reveals that Roy has continued managing Richmond after Ted's earlier departure. His major achievement before Ted returns is winning the FA Cup, one of English football's most historic domestic knockout competitions.
This fact describes Roy's managerial success rather than his earlier playing career. The FA Cup is separate from the Premier League, which is decided through a league table, and from European competitions such as the Champions League. The reveal gives Richmond a successful recent past while setting up Ted's new role with the women's team.