Question: Have any Australians played Carlsen OTB, other than Smerdon and Smirnov?
ABC News suggests there have been other games:
Queensland Grandmaster David Smerdon is one of the few Australians to have faced Carlsen over the board, holding him to a draw at the 2016 Chess Olympiad in Azerbaijan.
ABC News, 2021.
I'm guessing people might be downvoting because it's basically impossible to eliminate the possibility that there were Carlsen vs. Australian-player undocumented games played e.g. in a bar. I'm mostly just interested in what's available in databases. I personally don't own a database, and I'm not sure of an efficient method to check online databases for "Australian player". The answer might very well be "there are no others recorded" (cmgchess's comment seems to suggest this), but I don't know.