A true multiversal has two or three handlines supplying it, hence the term "multi". I don't believe a prepiped deck gun is the same. The old multiversals could be operated off the top of the engine or down on the street.
In most areas any portable master stream device is considered a multiversal. As mentioned above the old ones used to have two or three 2 1/2 inch hose line connections with flapper valves. New ones coming many configurations including the TFT one you have. Master stream devices that are permanently mounted to a truck are not considered a multiversal however.