Not talking about Farsi, I can't understand what they said in the video, but in any case looking at this video I have the impression that the images in some frames are enlarged, so as to make the viewer think of a modified prototype, but if you take screenshots and you try to correct the dimensions in width (also by observing the characteristics of the images of the technicians and workers present) you will realize that this prototype of the Yasin is not very different from the one seen previously.
However this remains my personal interpretation, to dispel any doubts all that remains is to wait for good quality photographs