All the info came from the troll's posts, that are publicly available. Also this isn't a normal troll, but a malicious troll who is transphobic, defends Nazis, tells trans and other vulnerable people to kill themselves, steals women's selfies to catfish people, etc. It's not "slander" as the troll likes to call it, there's tons of links and it's all 100% true.
The troll in the example is highly manipulative and try to paint themselves as a victim who is being targeted for no reason, but the links in the description of this video say otherwise. Those links go to comments the troll posted on their own accounts including creepy comments they made towards a boy they knew was only 14. They gaslight, guilt trip, and use other abusive tactics to get away with their malicious trolling.
The mods/admins were fooled by the troll who took the troll's manipulation that they're a victim of slander and doxing.