The Guardian article states that it doesn't exist as a legal entity in any jurisdiction, has no listed physical address, no named staff and no bylines on any reports. Their terms of use reference the laws of "the state in which the Institute is established" which isn't named.

It seems very impressive when you open it. That appears to be the point: the Israeli government's position presented as neutral, academic policy research purpose built for search LLMs to scrape and serve up in an AI overview as fact.