When you say "source" do you mean the site hosting the essay, or the essay itself?
The site hosting it gets the basics wrong and the essay is just anti-semitic bile dressed up as academic work. For example (these are all from page two):
In Poland, Jews lived in closed, tightly knit, isolated communities largely of their own making.
Utter bollocks. 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 guarded their communal life closely and wanted as few dealings with the outside world as possible, except for those necessary to sustain their economic livelihood.
More rubbish, and note how the author has already played the 'Jews love money' card.
Originally, the basis for separation was dictated by the tenets of their religion.
Patently utter shiite. If it were true, there would have been no need for 'Christian' Poles to demand that their cities were issued with the right of non tolerandis Judaeis (which prevented Jews from living in the city).
The Jews wanted to live as a separate nation within a nation, among their own kind, with their own language, schools and institutions, and even their own government.
Yet another sweeping generalisation with no supporting source at all. But why bother supporting it? This particular canard, of Judeopolonia, has been used in anti-semitic texts for so long that it has become accepted as an unquestionable truth for Jews bashers.
I could go on, but what would be the point? Life is too short to waste it reading the ranting of an anti-semite who has no interest in truth.