It's not a CIA op or something. It's just anti-semitism.
Vatican II included a stance of not blaming jews everywhere for the death of christ and opened itself up to the ideas of other religions and science.
This ended up leading to an apology for the persecution of astronomers such as Galileo and Copernicus years later
They use the flat earth thing as a dog whistle for wanting the Catholic Church to go back to its old ways.
That's all it is. It's just trad cath fascists jerking themselves off and some dumb guys following along not realizing what they're doing.
Laughing at flat earthers is fun but remember something like 40% of US Americans believe the universe is less than 10,000 years old. Sure, you can go outside and see that the earth isn't flat, but you can also look up at the night sky and the fact you can see most stars is because the universe is much older.
Young Earth Creationism is just as silly to me as Flat Eartherism, and a lot more people actually believe it.
I'm not laughing at it, it's Nazism in disguise. It's dangerous