If you get feedback that doesn't make much sense, it's likely not the real reason. Just like if a date rejects you, they'll give some silly fake reason why.
I like that one. I've done interviews where the answer should be at most a summary sentence, and 2-3 supporting points. I know the candidate knows the answer, it's a warmup question! Then what do I get? Word salad. A gigantic run-on sentence where the candidate talks and talks and talks and this, and that, and also, and furthermore... lasting 5 minutes or until I politely interrupt with, "OK let's move on to the next question."