They were interviewing him in the dugout. Because the first question took so long (between going through his interpreter both ways), combined with how quick the inning went... they decided to not ask him a question because they felt it would go to commercial really quickly. Then the color guy says "I want to ask him one real quick... how long did it take him to learn 'Go Cubs Go'?"
Then - because the translator was DOING HIS JOB - the color guy says "just ask him to sing it!" - like Shota's a performance monkey to do ESPN's bidding.