I can categorically declare that statement complete nonsense. Regardless of which of the nation's three official languages is their 'first' (they pretty much all speak all three - and English - anyway)
Off topic a bit but this reminded me of the time I stayed in a hotel in Geneva. The Swiss guy in front of me was checking out and speaking Schweizerdeutsch - which the hotel reception clerk didn't understand, he insisted in speaking French, which the guest couldn't (wouldn't) speak - this went on for some time before business was eventually concluded in English. So, don't assume that all Swiss will automatically speak another Swiss language.