I talked to DEEP also They told me the same thing the new regulation isn't actually approved yet so although it is in the book it wont go into effect until January. I guess we will need to keep an eye on it.
And, to be specific, the regulation does say you will not need a stamp for waters stocked at no expense to the state. You only need a trout stamp to "possess on the waters of the inland district or the marine district, or on the shores of such waters, Atlantic Salmon, trout or kokanee without first obtaining a trout stamp".