yobbo's post might have showed up during an invasion, but the account seems to have been active since last November. Making several posts about evidence supporting a round Earth. Granted, there are some committed long-term trolls on this site, but the OP's posts don't exactly read like troll posts (I took a quick peek, admittedly not a comprehensive study).
Am I a troll? I was posting during the invasion, and I hadn't posted to very much prior to that. But if having the unfortunate timing of posting during a troll offensive makes one a troll, I must fit the bill too.
I did see a poster claiming to be a famous author. It was really amazing. Another new poster was ranting and raving, mentioned this author's very-hard-to-find book, and suddenly the author showed up and began posting right on queue. Maybe if I just mention David Attenborough's name, he'll show up and say some neat things for us. David? Are you out there?
Anyway, yobbo raised a perfectly valid point and it's one that doesn't need to rely on verifying whether there is or is not a CSIRO scientist that he knows who actually made the journey. Jon Sanders did it twice in 1981 and 1982. There's a yacht race called the Antarctica cup. If Antarctica was actually the ice wall and circumnavigating it worked differently than yobbo described, it seems strange... dare I say, impossible?... that it could have been hidden so well for so long.