Really?! I thought almost all adult Chinese know about it! How can he be so dumb?! Well, I never think he is well knowledgeable anyways (same as many other "DJ").
I don't expect they know everything. But at least they should do some research before saying out something to the public for anything they're not sure in the first place. Just simply click to the net, it's so easy to do.
Quoting "聽人講" doesn't make him (them) innocent or any smarter. But instead, a wiser way should be to clarify whether the information is true or not before saying it out. 無料就無料啦!