Just playing with geography, numbers, politics and the news. So I take the bigger point of this just announced by the city (in the PG version: Pittsburgh Mayor Peduto takes steps to attract more immigrants to Pittsburgh)
But just keep in mind something we all do a lot, which is to conflate Pittsburgh, the city proper, with Pittsburgh, the region as variously defined. But on this topic of immigrants this really matters. The low rate of international immigration that is often mentioned (here and elsewhere) is very much a regional metric. I at least have not spent much time benchmarking cities, although most assume the pattern is the same as for the region which is not a jump you always want to make. When it comes to international immigration, the city of Pittsburgh proper has some different stats. Here is the data I see for the impact of the foreign born population arriving relatively recently (since 2000) among counties within the Pittsburgh MSA, along with similar metric for the city of Pittsburgh and with Allegheny County divided into city and non-city portions.
So the pattern of immigrants living in the city is actually not that different from a national average. Still lower than a lot of other comparable major cities mind you, but what is really different about Pittsburgh is just how low the recent immigrant numbers are once you get outside of the city proper... and then into some extremely low numbers once you leave Allegheny County. That is a lot less talked about in general, but the contrast with the city is pretty stark.