My answer to the question in the title would be 'yes'. But what does Henry Kronk say? The article presents a research report by Amy Nusbaum, Carrie Cuttler, and Samantha Swindell. They "tested OER use against the textbook their department currently uses for their introductory course." So far as I can judge, that's probably the most limited and and uncreative use of OER imaginable. But we forge on. "Class-by-class, book-by-book, marginalized students are more vulnerable to financially-driven decisions that can negatively affect their academic progress and outlook, decisions their peers are less likely to encounter," write the three authors. So, yes, OER can help.