I saw this video as well. It is depressing. They should make a video of people who fully overcame their social anxiety as a follow up.
Imagine a clip on youtube about someone with severe social anxiety everything like this video you have posted up. Imagine then a few years later because of this person's commitment to getting better they overcame all of the problems from the initial video right now.
Social freedom experiments will scare you and raise your anxiety to elevated levels. If you keep going and keep doing it, you will grow through it and talking to strangers will feel like a normal experience. All off the mood orders and secondary problems associated with social anxiety will disappear.
Check out this video I found, love to hear your thoughts.