DIF tests are used to examine which item might favor a specific group, resulting in unfairness. Investigations on DIF items are conducted on item by item, not on all items simultanously. Conducting adjustment to control the type I error rate is most often used when multiple groups are compared several times. I also checked the papers cited in this study, which were using such adjustments because the focus of their DIF studies was to investigate if there was a preference for a specific group on "an item". Therefore, there is no reason to apply such adjustments to compare all items simultanously as this paper suggested.