I could go on, but what would be the point?
Before "going on", would you kindly read the whole text? Because it contains a lot more than just sweeping generalisations.
Also, you say:
In Poland, Jews lived in closed, tightly knit, isolated communities largely of their own making.
[...] Jews accounted for a third of the population of Warsaw. For the same proportion in Lodz. For 42% of the population in Lwow. 45% in Wilno. Yes, some Jews did live in closed, tightly knit, isolated communities but the majority did not: more than three quarters of Jews lived in cities and towns.
[...] Jews accounted for a third of the population of Warsaw. For the same proportion in Lodz. For 42% of the population in Lwow. 45% in Wilno. Yes, some Jews did live in closed, tightly knit, isolated communities but the majority did not: more than three quarters of Jews lived in cities and towns.
You are absolutely right, and the author is right as well. It is quite possible to live in cities and towns while creating closed, tightly knit, isolated communities. Warszawa, Kraków, or Prague had large, separate Jewish quarters. Without resorting to words like "ghetto", you can see identical processes taking place in modern Britain or the US, for example. Some parts of London / New York have been pretty much taken over by Poles / Greeks / Chinese / Pakistanis...
I could counter all your other arguments in a similar way, but unless you read further than page 2 of the essay, I am simply not interested.