From the wikipedia page about the Chile telescope, resolution is about 10^-7 radians. From the article, distance is about 450 light-years. From the wikipedia article about light-years, one light-year is about 10^-13 kilometres. In "bc" I get this.
10^-7 * 450 * 10^13
In other words, about 450 million kilometres resolution. That's about the diameter of the orbit of Mars, I think. (I'm too lazy to look it up.) So we should be able to resolve distances equal to about the diameter of the Mars orbit. So that image must be showing orbits that go out to about Neptune, which goes at a radius of about 4500 million kilometres. Well, that kind of makes sense. But it's still utterly astonishing resolution at that distance. I wonder what they get in the 4 to 10 light-year range. And when the next telescope comes long, it will be even more breathtaking. The following is in the wikipedia article on the Chile telescope.
"Although it is designed to have a resolution 10 times greater than that of Hubble, it will be superseded in 2024 by the Square Kilometre Array in South Africa and Australia, that will have 50 times the resolution of ALMA."