Yeah, this video is pretty much what took me off the "fence" about flat earth. I thought ... unless they completely fabricated these experiments, it's case closed. They say they've published all their data and how to reproduce the experiments, etc. on their website. They call it convex beause they talk about how the continents rise up in the middle, and that makes sense, but essentially it's flat earth. Being in a different part of the world, they seem detached from the English-speaking "flat earth" movement and came up with their own term. But no doubt these guys were secretly driven by DuBay.
These guys don't appear to be motivated by Scripture, and they seem pretty open to possibilities. Where I might disagree is they believe that the "atmospheric lense" is kept in place by the earth's magnetic field, and they don't consider the possibility of a firmament. It doesn't appear to have been in their thinking. But they do propose a model whereby light is scattered the way it is due to a lensing effect (which we hold to be the firmament). They studied sun angles from all over the world and found a number of discrepancies vs. what the globe earth would require.
I found their finding of a new continet interesting, since Admiral Byrd did hint at it himself. But evidently they came up with this model taking meticulous measurements. This was no mere artist's conception.