They might try to say that. I didn't see any video or any test procedures, but I don't think it's what they say it is. I guess they are trying to say that the zip tie in a "static" position acts as fixed object and the trigger resetting hits that fixed object and "pulls itself" again. Based on Rare Breed's videos and description of how the FRT works, that isn't possible. At best, in their own imagination, the zip tie flexes enough to act as a spring that the reset stretches and, when it bounces back, it pulls the trigger.
I'll have to dig around to find it, but I think this is the same thing they did to Len Savage to claim his sample upper was a machine gun. They used zip ties, loose chains, and all sorts of other bad faith tactics. Reading Len's side of things, the ATF has a flat out vendetta against him and treat him unfairly because of it. They even expressed as much in writing in emails. IIRC, that was a decade ago and last I heard they still haven't given his sample back.
Either way, I'm not sure it matters since the complaint alleges that the FTB was manipulating the zip tie to get each shot to fire. Put plainly, they tied a zip tie to the trigger and used that to pull the trigger each time instead of using their finger to pull it each time.