Only part of the article was given to the Oberlin City Council. Much of the rest of the article is sympathetic toward immigrants. The article also does not say what local nurseries and factories would do if they could not hire immigrants at minimum wage.
The real problem revealed by the article is that the immigrants "hurt the district's ranking with the state" by doing poorly in standardized tests. Excluding students who may do poorly is not a legitimate or moral way to improve test scores. Instead, the scoring system needs to take immigrants and part-time residents into account.