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.
That is my understanding; the old FDNY multiversals had connections for three 2 1/2 inch lines. That is how it was done in the 1960s; I don't know when it changed.
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.