emergence of an Uzbek district in Warsaw
there are practically no districts in our country that would be inhabited only by one social group
The late 1990s early 2000s old commie built blocks close to Pałac Kultury had a _lot_ of Vietnamese residents. I was by the door of one waiting for someone once and there were 6 or 7 Veitnamese for each Polish person. Ul Grzybowska was the heaviest concentration... A Vietnamese friend said the border guard at the airport commented on her address "Grzybowska again!"
These apartments in the buildings were pretty small and very unpopular with Polish people which facilitated Vietnamese renting/buying them. I have no idea what the area looks like now...
And while the PRL had only the barest minimum of economic segregation it has drastically increased over the last 20 years or so not to the extent of western Europe but a lot more than there was so the professor might be engaging in wishful thinking...
For the record I think the lack of economic segregation was one of the few good things about the PRL... when the very poor or very rich only have each other around.... it's not good for them.