The question is that why do people like him believes this. There are already studies and proofs of it and now there is a person getting fund to lunch a rocket to prove that the earth is flat.
If you ave a proper look yourself you will see it is flat, if you listen to the main narrative they will have you believe it is not flat by the use of cgi and so called scientists that are paid to lie to you and then when asked to explain themselves they confuse you with mathematics and experiments that don't add up under scrutiny. Born out of this confusion is the fact that you loose while they sit in their ivory towers and only come out to add more confusion.