Hungarian, AK variant, "standard AK muzzle device threading," etc... So much wrong info. He clearly was going through the motions on this one due to audience demand -- he wasn't open to it nor did he attempt to learn or verify what he was saying...
He's a knee deep AK guy, so there's no room in his system/philosophy for use for the VZ58 -- hence, the cold shoulder.
Uncertain about the condition of the gun overall and gen, but the following are my thoughts:
-Seems to be hanging up on the disconnector portion of the cycle
-Could be worn recoil and striker springs (not enough force to push it back into battery)
-Push down plate with bevel would help to make that disconnector disengagement less abrupt
-Ammo could be underpowered, not at all familiar w/ Red Army Standard brass
-Also could be related to the bolt dragging/hanging up on the lower receiver or ejector with those rails being a little too low on the later gen VZ2008s
And anyone using the Century slant on the gun is doing themselves a disservice. At the end of the vid, you can see the guy fighting the gun pulling sideways, which it wouldn't with any VZ58 specific brake or flash hider that doesn't affect recoil -- at the point in the video where he creepily says "daddy fixes" to the other dude...