NASA has been caught faking so much footage that you can't believe any video THEY produce. CGI makes anything possible. When you have that kind of budget, you can produce CGI. They were caught with the "Mars rover" in Greenland, with fake footage from "ISS" ... not to mention the faked moon landings. Musk's "Tesla in space" was such a bad job, on the other hand, that even he remarked that "you know it's gotta be real because it looks so fake. We've got better CGI than that." In order to fake curvature, you need nothing more than a fisheye lens. At about 17 minutes into the second video (I just skipped through different sections) you can even see the fisheye lens at work as the curve reverses ... watch from 17:00 - 17:30. Nobody's saying that the space shuttle doesn't exist anyway ... just that it doesn't go as high as they claim.
Meanwhile, there was a super high-altitude weather balloon launched by some private citizens and it showed the horizon to be flat all the way up. There's even one of a rocket that just stopped dead in its tracks at about 73 miles up ... which is precisely where it's theorized that the firmament is, with the firmament being made of solid oxygen. Some people claiming to work in Antarctica say that they make expeditions to where the firmament touches down and get samples, and it's made of a type of frozen oxygen that when it melts it goes straight to a gas and doesn't melt into water first (i.e. it sublimates).