Notice that you can barely find any towns in any of the scenes. Hamas has plenty of room in "the most crowded place on Earth" for military training exercises.
But beyond that is that Hamas doesn't ever fight the IDF in the open - but in the crowded cities of Gaza, hiding in their extensive networks of tunnels and bunkers as well as hiding in residential houses and buildings, where they use the population as human shields.
So this is propaganda on two levels - one to show off their supposed military might to their people, but also to pretend to the same people that they are defending them, rather than using them for military advantage.
NGOs like HRW and Amnesty bend over backwards not to accuse Hamas of endangering the population, but they try to find excuses by claiming that Hamas doesn't have a choice but to fight in urban areas.
This video is exhibit A that this is a lie.
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