Rudy’s father was a bit relieved when Nazis liquidated the Jewish population from Molching because it eliminated all the competition from Jewish tailors. What happened to his business was a result?

From the text:

Point Two: Secretly, though, he couldn’t help feeling a percentage of relief (or worse—gladness!) when Jewish shop owners were put out of business— propaganda informed him that it was only a matter of time before a plague of Jewish tailors showed up and stole his customers.

In the end, Alex's business was closed, while he himself was conscripted by the Nazi Party to work at an army hospital in Vienna while he mended uniforms.

Given his expertise in tailoring, he was given a job that at least resembled his profession. Cartloads of uniforms and socks and shirts would come in every week and he would mend what needed mending, even if they could only be used as underclothes for the suffering soldiers in Russia.