First of all, it wouldn't take "billions" of dollars to make a video of a fake heli performing 3D stunts......today's digital graphic software provides plenty of "realism" in many big screen productions for under a couple of K's........
Second of all, it's obvious a "non-believer" has not been around the RC heli sport, or for that matter, around any live RC aerial event. So don't knock yourself out trying to convnce one.......
Third of all, only a small percentage of RC heli pilots are able to perform the type of "tricks" shown on the posted video. It takes years of practice, very good and expensive equipment.....not to mention a "God" given physical/mental ability to perform consistantly and over long periods of time.......for every 5 guys who are able to do this stuff, there are 1000 that will never be able to.
So, it's good your'e excited about the hobby, and starting conservative is a very wise idea......by the way, the "thrust" is provided by the heli's main blades pitch and speed.
Good luck to ya......keep it simple and most of all have fun!