although, the fact that he's wearing level 40 gear at a lower level is interesting.
I've seen this happen in a couple games, Sonny is one off the top of my head. You could rightclick or some shit while hovering over the equipment slot and regardless of whether you could use it or not, and even if it was over the wrong slot, it'd equip. It happened in a dungeon crawler series a couple years back, too, and when they patched the method that worked in Sonny, anyother way was found that did the same.
If the item storage in this game isn't entirely server sided, you could probably edit a couple packets and equip items you don't even have, if the check isn't very sophisticated.
I actually know nothing about this game though, but I think I saw something about it on reddit a while back. I actually feel sorry for the dev having to deal with his game being stolen by Chinese scumbags, and having to deal with people breaking it too
Edit: I'm typing words but the wrong ones are ending up in my post
lol idek why i still come here