You can definitely make up some reason why this UFO would be able to match the Earth's speed without requiring all of physics to be wrong, but it's actually pretty easy to get people like this to believe that everything we've been taught is a lie to cover up some grand truth that's being kept from us. It makes them feel smart and validates their common paranoia that world is against them.
It benefits the grifters leave these inconsistencies in because it weeds out the people who weren't fully hooked, and makes the ones who do continue to believe more delusional, isolating them from their support network and making them more reliant on the grifter. I unfortunately watched this happen with my mom, who ended up dying after spending most of her money on random scams claiming to cure cancer because she'd been convinced that the conventional treatments were the real scams.


