Anyone can act as a registrar as long as they follow the rules and only sign people up in/for the county the registrar and registrant reside in. There are some state guidelines/rules one needs to do to become a registrar but other than making sure you've done that correctly, go for it.
It was a wonderful story and he told it so well! As others have pointed out, racism in the south is different. It's about something more than just being different. There's a real visceral dislike, even hate, of "others."
I was reading about this earlier today as well. It's complete performative bullshit. MAGA will go buy meds there and thank TACO for all that he is doing not realizing that they got fleeced without any real savings. And I want to see the underlying financials on the sales. Do any of the profits come come back to Trump, directly or indirectly? Because I would not be in the least bit surprised if he isn't grifting off of this.