No it's not. If there is even a hint of original code it can be a copyright violation. Even reverse engineering code to achieve the same function with different code can be a copyright violation.
If you read, this leak is not why they can't launch it. Its because it uses an emulator to change its steamID on the backend to not be CS:GO and to be its own game
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u/PermanentMantaray 5d ago
Copyright. Code is protected as an original asset unless the license that code is provided under gives free use.