[2023] Z-42 Should Have Been Better

The Z-42 has not been altered since she became available.

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You may be referring to stats which only existed on the DevBlog when she was revealed as a ship that would be coming to the game. Shortly after the DevBlog was published, her stats were adjusted heavily so they would be more correct when starting the testing process. Test ships are not available for players outside of special programs.

YouTube videos would reflect the final version of the ship. Test ships are not allowed to be used for content until they are in their Final or nearly-Final state. This prevents incorrect information as the testing process can have significant changes applied over a short span of time which could make older content no longer relevant.

If you'd like, you can see the history of the ship via the Wiki: https://wiki.wargaming.net/en/Ship:Z-42