There have obviously been weekends and specs where they didn't do as poorly during that period... My understanding is "overall" means "on average" as in over the past decade they have not been able to put consistent wet weather weekends and/or sessions together across multiple drivers and multiple generations of cars. Whether that's because they don't understand the prep required, they go the wrong setup direction, they misjudge the strategy, and so on
Again, Leclerc is not the first Ferrari driver to bring this up so I don't know why it's controversial only when he says it.
