"metro" as in (Atlanta's) metropolitan statistical area, this is not about squatting in subways' nooks and crannies ("subway" as underground transportation, not sandwicheries).
There's something fishy about the article upon closer inspection.. reportedly by "Justin Gray" but he's quoted in the article more than once. Does Justin talk about himself in the third person? It looks like the source-article (on wsbtv.com) has the same language[0].
[0]: https://www.wsbtv.com/news/local/atlanta/this-is-stealing-ch...
Like you, I was confused about Justin Gray since he repeatedly quoted himself. There were also a lot of unclear pronouns throughout (things like, "He told him how he did that") which I really struggled to follow initially. However, watching the video it made more sense.
So Justin Gray is the reporter who did the story. He narrates the video, and so the transcript makes it seem like he is quoting himself, but its just a narration. Like I said, I read the whole article first and felt like it was written by a 5th grader. Then I realized it was a video afterward.
Metro is a terrible title for this, because metro is used in every major part of the country to mean the metropolitan area of the relative city. In this case it refers to Atlanta, but it could just as well be Denver metro, Chicago Metro, or anywhere else.
The title should read "Instagram account lets you squat in Atlanta homes"