We do create our own reality, but there is a plane called 'template reality' in where universal laws are defined. There might be some universe where planets are cubes, pancakes, they might even look like a lollypop, but in the universe we live in the laws of gravity work in a way that our planets over time become sphrere. Grab a telescope and look at the moon, it's flat? No! And neither is our earth.
Seriously, some people go to far into the conspiracy theory realm.
How can you tell the moon isn't flat with a telescope? Ive taken dozens of videos and hundreds of photos with a P900 and there's nothing indicating whether it's round or flat.