Rails best practices - too many remove unused methods

RBP - false positive

./app/models/user.rb:75 - remove unused methods (User#make_salt)
./app/models/project.rb:69 - remove unused methods (Project#completed_story_points_per_sprint)
./app/models/sprint.rb:14 - remove unused methods (SprintDatesValidator#check_start_before_end)
./app/models/sprint.rb:65 - remove unused methods (Sprint#user_stories_completed)
./app/models/sprint.rb:93 - remove unused methods (Sprint#expired?)
./app/models/sprint.rb:103 - remove unused methods (Sprint#completed_story_points_per_day)
./app/models/sprint.rb:133 - remove unused methods (Sprint#all_story_points_per_day)
./app/models/user_story.rb:70 - remove unused methods (UserStory#set_new_work_effort)
./app/controllers/sprints_controller.rb:56 - remove unused methods (SprintsController#stop)
./app/controllers/users_controller.rb:62 - remove unused methods (UsersController#accept_user)
./app/controllers/user_stories_controller.rb:147 - remove unused methods (UserStoriesController#request_feedback)
./app/controllers/user_stories_controller.rb:153 - remove unused methods (UserStoriesController#stop_requesting_feedback)
./app/controllers/user_stories_controller.rb:159 - remove unused methods (UserStoriesController#assign_sprint)
./app/controllers/user_stories_controller.rb:165 - remove unused methods (UserStoriesController#unassign_sprint)
./app/controllers/user_stories_controller.rb:171 - remove unused methods (UserStoriesController#add_user)
./app/controllers/user_stories_controller.rb:178 - remove unused methods (UserStoriesController#remove_user)
./app/helpers/current_helper.rb:3 - remove unused methods (CurrentHelper#current_project)
./app/helpers/current_helper.rb:11 - remove unused methods (CurrentHelper#current_sprint=)
./app/helpers/travis_helper.rb:9 - remove unused methods (TravisHelper#owner_and_name)
./app/helpers/travis_helper.rb:18 - remove unused methods (TravisHelper#check_travis_repo)
./app/helpers/travis_helper.rb:35 - remove unused methods (TravisHelper#check_travis_api)
./app/helpers/statistics_helper.rb:7 - remove unused methods (StatisticsHelper#generate_burndown_chart)
./app/helpers/statistics_helper.rb:39 - remove unused methods (StatisticsHelper#generate_burnup_chart)
./app/helpers/sessions_helper.rb:3 - remove unused methods (SessionsHelper#sign_in)
./app/helpers/sessions_helper.rb:8 - remove unused methods (SessionsHelper#current_user=)
./app/helpers/sessions_helper.rb:12 - remove unused methods (SessionsHelper#current_user)
./app/helpers/sessions_helper.rb:20 - remove unused methods (SessionsHelper#sign_out)
./app/helpers/sessions_helper.rb:35 - remove unused methods (SessionsHelper#user_from_remember_token)
./app/helpers/sessions_helper.rb:39 - remove unused methods (SessionsHelper#remember_token)
./app/helpers/sessions_helper.rb:43 - remove unused methods (SessionsHelper#deny_access)