To uninstall the sample data again, run:
bin/magento example_dealers:list
bin/magento module:uninstall --non-composer Yireo_ExampleDealersSampleData
bin/magento module:disable Yireo_ExampleDealersSampleData
bin/magento setup:upgrade
bin/magento example_dealers:list
To re-add the sample data:
bin/magento module:enable Yireo_ExampleDealersSampleData
bin/magento setup:upgrade
bin/magento example_dealers:list