That's from the CPS 100kW-125kW inverter manual. Unfortunately, I don't have a list of inverters that can be connected to an ungrounded service.What brand/model is your example from, and are there others you are aware of that are similar?
I guess the existence of that manual settles the questions in my earlier posts today.
Cheers, Wayne

100kW-480V String Inverters for North America | CPS America
The 100kW high power CPS three phase string inverters are designed for ground mount applications with 480Vac service voltage.
