That's exactly true. In Sweden, because everyone speaks English and will switch to English at the first sign you're having trouble with the Swedish language, it's nearly impossible to learn even after many years here. If your job forces you to speak the native language, you will eventually learn, but many jobs, like mine, are fulltime in English.
Right, my advice to implants here in Norway is to enroll into communal language courses. It's endemic among the tech folk to assume they'll ace it by osmosis. Years later all they can do is to smile at social functions.
And start shutting them down when they start switching to English on you -- by switching seamlessly back to your hobbled Swedish, no matter how bad it is.