Trespassing (intransitive) is different from trespassing someone (transitive). It’s not unusual for a verb to mean something different when used transitively versus when used intransitively. To “trespass” someone (transitive) means to ban that someone from a property. Wiktionary provides examples of “trespass” used in this sense as early as 1946.

> albeit sa uniquely american one? Never heard this from e.g. Brits

According to this lexicography blog post, datasets reveal the transitive definition to be most common in New Zealand. https://www.visualthesaurus.com/cm/dictionary/trespassers-wi...

Here are some examples of it being used on a NZ website: https://www.police.govt.nz/use-105/trespass