Nope, that is not what it means. If it meant that, a super controlling ex could use it to totally control the other parent. What that means is that each parent is entitled to make ordinary decisions that effect only their time, on their time, and that decisions that impact both parent's time, or that are major health or educational decisions must be made jointly.
If dad were here we would be telling him that he cannot stop you from allowing the child to spend time with grandma during your parenting time.