Reality and perception are two different things. When an artist, such as a Picasso, paints, he may have one idea in mind of what the painting represents. However, how others may view it is quite different and that perception is open to interpretation. However, that is merely the opinion of the viewer and viewers can usually see anything where nothing exists.
In this case, the artist has called this a factory. If the viewer sees a camp, that is their interpretation.
However, laid on top of this is the assumption (and a correct assumption in my view) that no toy soldier manufacturer would ever make anything having to do with the Holacaust. Would any manufacturer make inmates being led to the ovens from the trains, huts with barbed wires surrounding holding inmates whose turn is soon to come, bodies being taken out of the gas chambers, guards and penal battalions picking out gold, silver and jewelry from their mouthes and other human orifices, and trucks then to take the bodies to the crematoriums?
The answer is obviously not and that is why any interpretation believing this to be a crematorium is not founded in any kind of logic.
As far as the supposition that it must be a crematorium because a prisoner is being led away, the camps were the province of the SS, not the Gestapo, and a prisoner would not be led away from the crematorium. For those who did not survive, it was straight from the trains to the chambers to the crematorium. Such a prisoner would have long died.