I can understand that there is no pricing tag for the 400g engines as they are Not produced yet. But maybe his statements base in the 100g engines because they are in production right now as Raju stated in his last video?! There hast to be a price tag for them.

One possible explanation could be that he heard about the priced for the Alpha&Beta samples. They are always more expensive than the final product because of the relative low number of units produced.