Yes, there are a bunch of funny gimmicks in there. The question is, if there is there any actual record of this ever been done on a greater scale, like arming a whole army with stuff like that? A Majra for example is a simple thing, possible that many carried such a tool, but equiping an army of +100.000 men with such a large number of special arrows is an effort of a completely different scale. How many arrows did each man carry? 50-100?
The whole thing wouldn't be unlikely if the Mongols shot an unusually short arrow and the russians relied on a very long draw and large bows. That wasn't the case. The bows of the conquest era were comparably large, with arrows that make for a 30-32" draw.
There are so many bogus stories about the Mongol armies floating around, I'm quite sure this is another one.