That's not the same. It just means the yes/no vote is just proportional to those that voted. 50 people voting yes and 50 people voting no would be split evenly

That's not the same. It just means the yes/no vote is just proportional to those that voted. 50 people voting yes and 50 people voting no would be split evenly at 50% for both opinions. But if you have 50 people voicing idk, you have 33% yes, 33% no, and 33% idk.