tl/dr. He's a dumbarse football player.
Flat earth theory is not open minded, it's weak minded and supports a common theme of modern indoctrination. It's also a very sad reflection of the decaying education system of the Western World.
Firstly, you can prove the world is an ellipsoid yourself if you feel the need to try to prove to yourself that it's not. I'm not saying that you believe that the Earth is flat btw, yet to support stupid theories and call them open minded, is mind bogglingly f**king stupid! Whereby those who do, listen to a number of ever-growing idiots who have cherry picked basic science and twisted it to prove a make-believe theory SEEM like reality. This goes with all stupid theories that have exploded onto the scene in greater numbers of dumbfounded, dipshitery since 2020, yet they were there in the 70's/80's and 90's, just carrying on louder than ever into this century because the internet gives more idiots a voice.
Talking about indoctrination, some people have literally lobbed off their old fella, ate/drunk poison to catch a f**king spaceship to "save" themselves from the coming cataclysm. /rant.