My interpretation The administration wants to label antifata as a foreign terrorist organization. This would add legal teeth to stop anti fascists. Any organization that this administration thinks is anti nazi or anti fascist could legally be shutdown if this goes through.
They do touch on that in the article that’s it’s a way of thinking not an organization but the guest doesn’t think it matters. Trump said on TV he’s going to do it so unless he’s challenged I think he will get away with it. This will then give him teeth to go after anti fascists.