Nestle and their other company Wonka candy will disclose any gluten in their products. All you have to do to determine if it's gluten free is read the label.
Then why change the label ?
From a legal standpoint, if they do not label the package "gluten free" they don't have to make it that way, be consistent from batch to batch, nor do they have to guarantee that the item is that way.
It says the consumer must take the initiative to contact them repeatedly, and then rely on verbal confirmation that the item has not hidden anything in the ingredients.