@Geoff P That's like someone claiming to be multilingual because the can speak English in the US, Canada, England and Australia.
As funny as this sounds... I was once in a teleconference meeting where one group was from Russia, another from China, and myself. The meeting was held in English because all parties knew how to speak the language. Unfortunately, the heavy accents made it difficult/almost impossible for the Russian participants to understand Chinese-english, and vice-versa. Both parties could understand my Canadian English and I could understand their English.
This meeting ended up with me being -literally- an English-to-English converter...