Maybe they mean that there is high latency? Or maybe they mean it is a car radio and is kinda broken and isn't changing the song or something.
Duolingo needs to reflect on its purpose a little more. After my first 6 months in Korea, I didn't care about slow radios or Internet memes. I struggled to ask for the check at a restaurant or make a deposit at the bank. Maybe we could get something like "Their tellers are especially slow?" ....
The first time I got this question I was translating "His radio show is especially slow" from English to Korean and the accepted answer was 그의 라디오가 특히 느려요. Now translating it from Korean to English it won't accept "radio show" (DuoLingo's original answer). I'm assuming this is the type of thing I should report?