I agree they certainly aren't the wayward pizza guy, but it is still far from simple.
"Private Property" signs are something different than "No Public Admitted". Any mall has a private property sign, that doesn't mean people aren't allowed in.
I'm a unsure about the location of the Jeep. It sounds like they drove into Tesla's parking lot, then proceeded on foot towards the factory. If the lot was open to the public (no gate) then the initial trespass is far from clear. Climbing a fence weights towards trespass, but I want to see more about this fence. If it was the sort of barb-wire fence normally found around factories, how did they do this? Or was it a small sort of fence meant to direct foot traffic around grassy areas.
If they instead parked on the street it gets even more complex. If they walked in on foot and were asked to leave, they appear to have done so. So they were not trespassing after being confronted by guards. And that would place the physical altercation off of tesla property, totally complicating the liability issues. If you seek to detain someone you don't normally allow them to leave the proper, let alone them access their vehicle.
