Not necessarily, the suggestion is that the second generation would have reduced use of the mother tongue, and it would be diluted with each generation.
But that survey was conducted in 1999, and the ebbs and flows of migrants obviously varies over time.
But the principle remains, that continental Europeans (the same can be said for any large landmass with multiple nationalities), in general grow up dealing with various languages and it is part of their daily life.
On the other hand when foreign languages are heard in UK, many take exception to it, and even violent exception, occasionally.