"I" does not have a problem speaking and understanding the english language.
His planet has been monitoring radio and tv transmissions since the start of this activity on earth. "I" said that groups on his planet are designated to learn a language for the planet and country they are assigned to visit.
They also receive and monitor the video transmissions. They learn how earthlings dress and interact with each other. They blend in very well where they go so as not to stand out in the crowd.