Destin, the person behind Smarter Every Day was ex-military and he interviewed his old commanding officer. It was clearly mentioned that the military is doing this to reach out to potential recruits while sharing interesting knowledge. I believe the actual episode is https://www.youtube.com/watch?v=qOTYgcdNrXE
It is important to note that things can be more than one thing at once. The general in the video says that Destin created a weapon (of information), which would be propaganda. But the video is also highly informative and educational. Destin is in it for the education and cool factor. The military is in it for the education, cool factor (potential recruits), and show of power (to potential recruits, civilians, and foreign civilians). From my understanding, Destin has pretty free reign in what he can show (military does have to approve but he is free to speak his mind).
The fact that this is also propaganda just means that the military has a motive to show this other than for purely educational purposes. That's all propaganda means here.
(Note: I'm not arguing with the parent, I'm expanding on because of sibling comments that do not seem to understand the nuance)
It's fairly un-nuanced: get special exclusive access to military resources, and call the military resources cool in a way that the military approves of.
That's propaganda. Whether you think that's bad or good or there is nuance is still for each person to decide for themselves but nevertheless that's pretty much textbook propaganda.
