RE: Uncle bob
Of course Luke a whiny turd at the start. He is stuck on the ass end of the galaxy desperate enough to go to into government military service to gtfo. He then gets lied to, pushed to physical, mental limits and emotional reveals. He has legitimate complaints. Of course the video has a lot of BS for comedy reasons, had some laughs.
He is experienced with flying, combat manoeuvres and shooting but his 'shoots back at you' combat inexperience almost kills him when he disregards advice. They wouldn't have sent him up unless he had shown some aptitude or skill. Biggs could have vouched for his flying skills "Just like back home".
He barely survives the Death Star, gets saved twice and needed Wedge to cover him, as part of a massive team effort to make a shot that he might have never had to make. He gets shot down in ESB losing his gunner. He barely survives to the end of the trilogy and has to rely on an emotional appeal to an estranged father's core spark of good. His combat ability and use of the Force the majority of the time is defensive, unimpressive, weak compared to every other user.
None of this requires material outside of the movies and I haven't listed every example.
A little look into definitions. Here is a softball version.
https://www.youtube.com/watch?v=YhrfhQbY0K8
Luke is as about as far away from a Mary Sue as you could possibly get. Luke is an inspirational character not a self insert.
R1 answered a question nobody asked for from one line of dialogue. It was also answered better outside of the movie in the first Dark Forces game, Kyle Katarn stole it because he got paid to do so, killed a bunch of people to do it.
300 km is LEO and is space. Depending on the organization 80-100 km will get you astronaut wings. The lowest orbiting satellite I remember off hand was GOCE at 255km to measure Earth's gravity. 480km is an arbitrary number you threw out of nowhere. This is why I find you so disingenuous as you throw out obvious lies as chaff.