Answer:
It's true
Explanation:
The clay is not very resistant to its own weight, so when modeling large pieces or with long shapes away from the main body it must be done on a structure, usually of wires, that allows the mud to remain in place. This will not be a problem if a mold is going to be removed to later reproduce a piece in another material but if you want to bake the piece, this should not have an internal structure so the work should be modeled thinking that it can support its own weight.