Hey, if somebody asked me a dumb question that I wouldn't know how to respond to, I would also just say "I don't know".
To be fair, she's posting a comment claiming who the performers are (which is kind of stupid because many of those letters don't even have their own speaking lines) with no evidence to back it up, someone asked how she knows who did the voices, and she replies saying she doesn't know.
You're just making yourself look like a fool on the internet and wasting your time if you're claiming to know something and then not have any evidence to back it up.
It's like the equivilent of some fans claiming "X episode or segment was banned" and then they show no evidence to back up their sources.