Stars whooshing by.....wow. As you know the only star within 4 light years of Earth is our star, the Sun. The journey to the sun would itself take months and months. The only way you would see stars in the distance whooshing by is of the craft was traveling near light speed. I know it is difficult to understand because the distances involved are so vast.
Three hour mark. You can actually see them. Watch the damn video.
Notice how you still haven't actually answered the question? Are you saying it's exposed to the atmosphere during the launch?
How feasible is it that they could create a perfectly airtight chamber that is both detachable but secure enough to survive being stuck on the side during being blasted out the atmosphere, that when it detaches gets far enough away to not even scratch the paintwork?
Don't give me that "But they say they did it!" nonsense. That's completely circular. tell me how you think that is even possible.
They've been doing that successfully for more than 50 years. Here's an example of one that didn't work correctly:

Affectionately known as "the angry alligator", it's from Gemini 9. In 1966. They got better at it. How they make complex stuff look simple and be reliable is called "engineering".
"How feasible is it that they could create a
perfectly sufficiently airtight chamber that is both detachable but secure enough to survive
being stuck on the side [?] during being blasted out the atmosphere, that when it detaches gets far enough away to not even scratch the paintwork?"
Quite. That's what engineers do. They're trained professionals, and for some of them, that is their job.
You can see the Earth's reflection vanishing despite occupying the same basic location on the car's side; impossible by rotation, only possible by moving far away, but it isn't moving that fast.
The reflection appears to be moving relative to the panel. Rotation will cause this, and there's nothing except wishful thinking on your part that suggests it's anything but rotation.
Also:
You can see a star to the right there. There is no explanation for that speed.
How do you know that's a star? Watching that clip shows bright specks drifting "up" relative to the car, and others drifting to the right at the same time, the latter at about the same apparent speed the earth comes into view from the left. This looks like the system is rotating, that's all. Probably none of the bright specks are stars. Most likely, they are relatively nearby bits of stuff left over from the launch hardware.
You really do see what you want to see and ignore everything else, don't you?