Yes, but that's not what the parent was talking about. They said the tablet dissolves in the rinse cycle. Only way that would happen is if someone chucks the tablet inside the machine, instead of the detergent container where it should go.
Most tablets I've seen recommend putting it inside the washing machine, normally in the area where you put your knifes forks etc. This means it gets dissolved in the rinse cycle. Most machines I've used have dispensers that are too small for tablets to fit into so these can only really be used with powder.
