You asked me why you would assume he meant Epcot. 39 years is a pretty big clue, especially to someone who argues incessantly on a Disney message board all day. 39 years screams Epcot, unless your knowledge of Chinese culture would lead you to some other major event in the early 80s related to people sitting or standing for entertainment.
But don't forget that you also specifically said that circlevision shows didn't last in MK because because people would have to near twist off their heads to see everything. The China pavilion show has seating and the Canada is currently closed. But as you noted, Canada is standing anyway, and that's why he didn't say Canada.
Sometimes you're just wrong and it's ok to admit it, rather than twist your logic into something relevant to the conversation.