Tresspass is not a reflexive verb. It does not happen to you, rather it's an action you perform. Saying someone got trespassed is like saying you were driven when you go somewhere in your car, or that the door opened itself; you're taking the agency away from the person doing the trespassing and saying that they didn't actually do it themselves, but rather someone else did it/it something that happened to them.

This isn't a judgement on the article; it you don't want to say they were trespassing, then you should say it differently: they were _charged with_ or _accused of_ trespassing, etc.