I think a lot of people might assume copyright expires on death - it doesn't seem an idiotic notion on the face of it.
But if someone's not sure, the correct thing is to ask -which they did.
I don't think there was anything in the original post, or their previous posts, to indicate the poster deserved censuring.
Even if they did deserve rebuking; you rightly wrote on a previous occasion:
"Please make your points in a polite manner."