Steinhaus, Ulam and many other mathematicians in the Lviv school were Jewish, and had to flee or go into hiding to survive the German occupation. Interesting that there is no mention of this in the article.
I'm not sure how that relates to the OP since the article is on a Polish website. "Remains hostile" seems to suggest it was hostile before WWII. Remember, Lviv today is largely Ukrainian (as was Bandera). Most Poles, Jew or gentile, were either expelled after or killed during the war.
"He lived through the war under the name Grzegorz Krochmalny and hid in an estate near Lviv and at a manor neat Nowy Sącz. He gave private lessons in exchange for firewood, oil and milk. In his spare time he played chess and worked on designing a solar clock. During the war he resorted to solving serious mathematical equations by post but continuing his research from before the war was out of the question."
Seems like you're suggesting malice. Frankly, I thought the article was poorly written and chaotic, omitting things I would have included.
Also, not just Jews were targeted by the Germans:
https://en.wikipedia.org/wiki/Massacre_of_Lw%C3%B3w_professo...