They typically make mockups of their larger stuff for logistical reasons. Doesn't make sense to haul a massive missile all the way to Pyeongyang just to parade it around when you can easily just make a fake that looks close enough. People think that that means they don't actually have those weapons, but that's simply not true. They have a shoe-string budget and fuel is expensive. Now, that doesn't mean they don't embellish certain things. Their new tanks, for example, are certainly real and certainly new. However the armor on them makes them look more protected than they really are.
They typically make mockups of their larger stuff for logistical reasons. Doesn't make sense to haul a massive missile all the way to Pyeongyang just to parade it around when you can easily just make a fake that looks close enough. People think that that means they don't actually have those weapons, but that's simply not true. They have a shoe-string budget and fuel is expensive. Now, that doesn't mean they don't embellish certain things. Their new tanks, for example, are certainly real and certainly new. However the armor on them makes them look more protected than they really are.