This Has Got To Be Wrong. Am I Right?

No idea. I doubt that he had a clear definition of what a commemorative coin is, in the first place.

I think partly this guy was having a good time getting under your skin. Please see the definition of the term "troll". Anyway, to me the weird thing is that he refers to legitimate errors so what is the difference between legitimate and commemorative in his mind? How does he think these commemorative coins are made? Special machines or do they stop the machinery meant to produce billions of coins and manually monkey around with thing? I havent taken the tour since I was a cub scout but none of those things seems likely just to produce a few coins to sell in the gift shop.

Yeah, I felt I was getting trolled, but considering that the OP is a very knowledgable collector of *Korean* coins and currency, I seriously think that the OP was just being so confident about something completely wrong. Some older, long-time collectors think that they know the right answer to every numismatic case, and tend to be somewhat rude and disbelieving to younger collectors with less years they'd collected. (no collectors like that on CCF, though.)I guess the OP didn't trust me from the beginning, as I had less experience collecting than the OP. But that doesn't mean that you can be the expert on every coins......