I am. How could I not be if some of my main fields of interest(after industrial chemistry, if that is the correct English term for it) are orbital mechanics and astronomy?
I agree with his statement that if you sent a ship straight up, it would reach some altitude determined by launch speed(if it was shot out of some kind of a cannon), engines thrust(if it was a rocket) etc, and then, unless powered, drop down to Earth, almost exactly vertically, accelerating downwards at about 9,81m/s^2. Even on our round Earth this holds true - if a vessel doesn't reach enough horizontal velocity relative to the ground, it will drop down to Earth. Even if it went as high as, for example, the Moon's orbital altitude. Maybe it would miss Earth by a tiny bit due to Earth's orbit around the Sun placing it in a place slightly different from where it was during the ascent. But on a few hours flight it would be irrelevant.
We are not talking about reaching a stable orbit here, nothing about satellites, just about getting high enough to be able to clearly see whether Earth is flat or round. A few thousand km above the ground is enough to see the roundness pretty clearly, and at around 57k km you can see 45% of the globe at once - almost as much as it can get. Meaning you can pick up your camera, point it down and take a photo of "the Big Blue Marble". You seem to claim such trip would be impossible on a flat Earth(other than the obvious thing that on a flat Earth such a photo would be not possible to look like it did on RE). I disagree and try to explain to you why it is perfectly possible. What is the problem here?