EULA are 100% legal in all countries it is a legal contract.
Unless you can point to a specific provision and to what local law it violates they are legal. No matter what you think they are legal and enforceable.
The clause appears to be designed such that cheat creators would be liable within the game. A cheat creator could release a cheat from a known bug but not cheat themselves. Thus never violating the EULA though ruining the game for everyone
This is one minor way in which companies can go after cheat creators.
It's a bit of a round a bout way of doing it though